**If you suffer from aversion towards physics,don't read on.If you don't believe in mathematical/logical treatment of physics,punch the screen.If you are a die-hard fan of H.C.Verma or D.C.Pandey,strangle yourself to death.And if you think your college life(+1 and +2) got wasted because of physics,unbookmark my blog.I don't think you'll like what I'm about to write.(Ah!Wait..You might like some of the conversations between the authors and Anirudh.So go Ahead!)**

**The concept of purchasing multiple books for a course doesn't appeal to my senses;Instead,I believe in grabbing one book that would give me all that's required.I believe in books that leave a trail leading to discovery/invention.Like any other IIT-JEE aspirant,I bought three books for physics:H.C.Verma(The guy who thought people were dumb enough to accept his statements without proof),Halliday&Resnick(The low-price edition,sold only in India,China,SriLanka,Burma etc., A fat book with a plethora of unnecessary pictures),Irodov(All Hail to the master).Ooops! How did I forget to mention cheap-ass D.C.Pandey ,who did nothing more than Ctrl-C + Ctrl-V + a few changes(only reason for a litany of errors) of the above stated books.By now you might have realized that I consider D.C.Pandey's books as inferior.In fact,you can call them as**~~books~~ when Anusha qualifies to be a ~~human being~~.If you have a Zippo lighter,I bet you wouldn't mind wasting some fuel incinerating.

**When it came to physics in +2,I was an average student...**

**When I repeated for IIT-JEE, Prof.L.N.Prushti dragged me out of the dungeon of ignorance.**

**Driving force for the following section:His lectures,coupled with Irodov's books and long discussions with my friend Navneeth(Now,BITS-Hyd doing EE).**

__Proof of Coulomb's Law from Gauss Law____:__

**Whenever Indian Authors try their hand at writing/deriving something original,something they are NOT used to,they end up committing huge mistakes..One such flaw is the proof of Coulomb's from Gauss Law.**

**where L.H.S stands for Electric Flux through a closed surface 'S' and R.H.S is Total charge enclosed by surface 'S' divided by vacuum permittivity.**

**1.H.C.Verma emphasizes too much on the fact that 'E' in the eq. is the net electric field,but misses out on the validity of the equation across reference frames.Gauss law is valid in ALL reference frames,except ROTATING Frames.**

**2.The way books derive it is farcical.They start off by saying,"Consider a Gaussian sphere of radius r around the point charge.Now,they say Since 'E' is normal to the sphere,implying that it's parallel/anti-parallel to Area Vector,the L.H.S of Gauss law is equal to E.integral(A) over the surface 'S'.Integral(A) is 4*pi*R^2.Hence we get Coulomb's Law from Gauss law..Everybody is happy because they feel they proved something very fundamental.**

**Where is the FLAW??**

**Ans:**

**First of all who told him that 'E' is normal to the Gaussian sphere?? Where is the argument justifying it? They say because field created by a point charge is radially outward(inward depending on the nature of charge),'E' at that point is normal to the surface..Now this is ridiculous..This is a conclusion of Coulomb's law and we CANNOT use it to prove Coulomb's law itself.Gauss law is silent about the direction of field generated by a point charge.**

**We have to argue to prove our point.It goes like this...Let's ask D.C.Pandey a few questions.You can also choose H.C.Verma.He also committed the same mistake.You will WIN irrespective of the opponent.**

**D.C.Pandey:Okay,tell me how would you justify that it is radially outward?**

**Anirudh:Assume,it's NOT normal for a moment.Which direction would you assign???**

**D.C.Pandey:(Hope he doesn't say I don't know):How about a random direction??Say,One that points to Arihant book house at Meerut!**

**Anirudh:If you say that,I'll say it points to my home at Hyderabad.You can't prefer one direction to the other,DUDE!**

**D.C.Pandey: WTF?? Ummm..How about tangential?(With an air of impudence)**

**ROCK BOTTOM:**

**Anirudh:Which Tangent?-There are two directions to that vector. If you choose one,I'll ask you why not the other!**

**So,basically I WIN!! BIATCH! Hence the direction is radially outward(normal to the surface)**

**D.C.Pandey:Thanks for educating me!**

**Anirudh:Ah! it's alright..And Please DON'T thank me.Thank my prof.When I mentioned your book's name,he passed censorious comments..So,Fuck That..**

**The rest of the proof is the same.The crucial step: how's E' is normal to the surface.Some authors call it spatial/radial symmetry.Just because someone wrote it as symmetry everybody starts using the same words without knowing it's actual meaning.**

**Similar argument may be applied for other uniformly distributed charge configurations.Please DON'T apply it blindly-It might lead to erroneous results.**

__Discontinuity in an electric field:__**CLICK TO GET A MAGNIFIED VIEW**

**Anirudh:**

**As you can see,the above figure indicates the discontinuity in the electric field value on the surface of a uniformly distributed thin spherical shell.****For r less than R,E=0.Otherwise a finite value..**

**Hence for 'r' tending to R- , E=0 and for r tending to R+,it's a finite value.Therefore,the field experiences a jump discontinuity at 'R'.**

**H.C.Verma:So what??What's your problem,Anirudh??**

**Anirudh:What is the value of the electric field at r=R?**

**H.C.Verma:Lol! I seriously don't know! Wait Let me check my book**

*He flips through the pages of "Concepts" of physics Vol-2....*

*H.C.Verma:Sorry! I don't think field exists on the surface of the spherical shell..*

*Anirudh:Why?????????????*

*H.C.Verma:I didn't write 'bout it in my book.So,it shouldn't be there.I copied from one of the Authors in US.He didn't mention it..So,ditch that!*

*Anirudh:(I stifled a laughter):F*** the Americans..Do you know IRODOV? Have you ever heard of Russians-Their contributions to the field of physics??Did you know that a 12th grader in Russia knows as much physics as you do?*

*Okay,lemme educate you on discontinuity of fields:*

*Theorem:Suppose 'B' is a body with uniform charge distribution.Suppose also that the surface charge density(sigma) is NON-ZERO and FINITE.Then,*

*a)There is a "jump" discontinuity in the field value on the surface.*

*b)If the field vector is resolved into two parts(normal and tangential),then only normal component suffers a discontinuity.The tangential component is always continuous.*

*c)The normal component of the field on the surface is given by the "Arithmetic mean" of the field Vectors" in the neighborhood of that surface.*

*d)The difference in the normal components of the field is chargedensity/permittivity.*

**You can refer BASIC LAWS of Electromagnetism by I.E.**

**IRODOV****for the proof or CALL ME or SkypeME(anirudh.s2005) for further details about the proof..**

**An imitation of Irodov's proof:http://physweb.bgu.ac.il/COURSES/Electro1/extra/Discontinuity_in_an_Electric_Field.pdf**

**H.C.Verma:So,you mean field value on the surface is half the field value just outside the surface!**

**Anirudh:Wow!! At least you figured this one..**

**H.C.Verma:Not just that..I also understood why the field on the surface of a uniformly charged disk is ZERO..**

**Anirudh:Good!**

**H.C.Verma:Hey,don't leave..According to your theorem there must be a discontinuity in the field value on the surface of a uniformly charged sphere with volume density**

*"Rho"*?

__STUNNER:__**Anirudh:Huh?? I thought you made conceptual errors..Now,I understand that you have a problem reading the hypothesis..**

**For people like you,I highlighted words like FINITE and NON-ZERO...**

**Since sigma=rho*thickness and thickness tends to zero in a uniformly charged sphere-sigma=0.**

**Hence there is NO discontinuity!!**

**D.C.Pandey:WTF???What do you mean by discontinuity in fields???? Discontinuity is a concept in maths,NOT in physics!**

**Anirudh:Can anyone lend me a gun??**

__Oppositely charged point-charges moving towards each other:__**This problem was copied from IRODOV's book..And without shame the authors solved it from ground frame(K-frame).The problem is to evaluate the velocity of each point charge when the distance becomes half the initial separation..**

**It's not wrong to solve the problem from the ground frame.You have to justify it..**

**Dude,it's electrostatics:We deal only with charges at rest.Only when a charge is at rest the field is CONSERVATIVE ,a POTENTIAL function exists..**

**From the Ground-Frame,both the charges are moving and hence they aren't static anymore...**

**So the force between them is NOT given by Coulomb's law-It's something else...**

**Hence Potential energy is NOT defined for this system from GROUND frame..**

**Luckily,the answer turns out to be the same whether you solve it from the ground frame or the frame of reference of one of the charges because work done by internal forces is independent of the frame of reference...**

**Also one must justify this by going onto the reference frame of one of the charges.When I'm on one of the charges,the field is Electrostatic and hence Conservative..**

**Now,at this stage one must switch from charge frame to ground frame and Solve the problem..**

**For more info,you can SkypeME(anirudh.s2005) or MailMe(anirudh.s2005@gmail.com)**

**D.C.Pandey:I have an intelligent doubt..Can Potential function suffer discontinuity??**

**Anirudh:**

**You are a disaster..Why did Arihant publishers give you a Santro Car? You don't know what Discontinuity is and now you blabber as if you know everything about it..**

**Okay..Here's an assignment for you,Pandey:Prove the following theorem..**

**Theorem:Potential Function is always continuous...**

**I came to know you like the problem of parallel plates ..My friends told me your book has a huge set where you earth plates to the ground and ask them to calculate the charge on each plate..Here's a small question.**

**Q)i)Find what's the charge on the extreme surfaces?**

**ii)If you guessed a particular value(I know you would have guessed it as zero),Prove why it is zero!**

**Take your own time..Submit the assignment before you die..**

__Capacitors with Dielectric:__**One of the example problems of H.C.Verma is a duplicate of Irodov's problem.See pg no.163 (Concepts of physics vol-2)..The problem was to find the rise in the level of liquid dielectric in the capacitor when a charge is imparted..**

**The answer to this problem is wrong because the model of polarization is an outdated one where charge is considered only at the boundaries..There is charge in the bulk too.Who will find the force of that??**

*Tera Baap kya?*

*Here is another Ridiculous problem:*

*There is a capacitor with a dielectric.The dielectric is connected to a pulley which has a mass 'M'.The weight of the 'M' pulls the Dielectric down and the dielectric executes Simple harmonic motion..Find the TIME period of S.H.M...*

*(Prb 68..Unsolved)*

*This problem is correct only till executes S.H.M..After that,it's bogus..*

*There are many aspects to this problem*

*a)Why does it exhibit S.H.M or say an oscillatory motion?*

*(Hint:To answer this you have to find out whether there is field outside the capacitor..Answer is:Yes..there is a fringing field and it is non-uniform(PROVE THIS FIRST)..We have to use the "del" form of force to prove that there exists an inward force..*

*After that,it's impossible to proceed further as the capacitor is connected to a battery;As the dielectric moves,the battery removes charge from one plate and places it on the other..So the charge on the plates of the capacitor is***changing w.r.t time..The charge is not static implies field is not static and hence NON-CONSERVATIVE force..So one cannot solve this problem in Electrostatics..**

**D.C.Pandey went one step further and asked the readers to find the VELOCITY OF THE DIELECTRIC..FTW???**

*******End of Vol-I********

**Any new thoughts/proofs/contradictions to my views can be posted as comments..**

__-Anirudh Sreerambhatla__

__(Charge is invariant.Thus,content related to it ought to be invariant)__

Anirudh Ranganathinteresting. Especially the intro and the radially outward vs normal. Halliday, resnick, walker was good for me :)

AnirudhThanks..I knew you would read it..Not many are interested in physics..

AnuSad that i never used Irodov and used HCV instead for physics :| A book with everything would be totally cool.Makes the whole process a lot more easy and interesting.i seldom get a book with all that i want though. Good post =)

V.AdithyaHmm. It took me back to the good old JEE prep.days! =)

NavneethWow.....this is some fucked up shit. I appreciate the praise for the Russians. i like Russia like most people who prefer an intelligent race to one that buys its intelligence. anyway i just learnt that i spent two years reading a book that not only fucked up the concept but stole some too. whooo. one book for the whole shit would be good. i got myself fucked up even more since i read both the books. God bless Iridov and the few good teachers that remain in our overpopulated country.

Also we have a better chance of considering these thins as books than we do of considering Anusha human. you're uncovering some fucked up shit. Appreciate it

Anirudh@Anu:

True..Getting a good book with the above stated characteristics is a far-fetched idea.

@Adithya:

JEE==Indelible memories

@Navneeth:

Thanks for appreciating the Russians.I like the comparison between the Russians and Americans..

I believe You know Russians are chosen for the impossible tasks!

BalajiAh, relieving the good old days! :)

But you're true, these books usually clog my brains with rather idiosyncratic theories.

vamsilol I had fun..but dude are you obsessed wid physics??..I mean wats ur branch??..Its been ages and frankly I dont remember any of those...:P But yeah Prushti was one hellava lecturer..:)

Anirudh@vamsi:

Not really obsessed.Above all,I believe in perfection.And L.N.P was pretty good at that..

And yeah,he is one helluva lecturer..

RamyaThrowing light on the reality, that too in an interesting way...good

Anirudh@Ramya:

Thanks..

Do I KNOW u??

- The Virgin Author!This is fucking awesome, dude! I am presently in 10+2, and have been cribbing around with which books to buy, and shit. By the way, how did you miss out on Nootan, the book every one recommends you for Boards! =)

Also, I just don't get the stupid concept of trying Irodov problems before actually clearing the basic concepts via some EASY book, maybe NCERT for that reason! :P

Anirudh@VIRGIN AUTHOR:

I don't get the notion of NOT understanding the CONCEPT...

Bench a.k.a Raghu TejaAni planning on becoming a physics lecturer I guess?? You would make a really good prof.

Anirudh@ Raghu:

Like always I wrote it out of passion. My degree has trails leading to some other discipline.

brandMARIOHey... I'm takng part in the My Demand Contest. Ever thought of converting your "Pee to Petrol"??

http://www.indiblogger.in/indipost.php?post=30610

Please do vote for this. I bet you'll like it ;-) And do share it with others if possible.

Thank you :-)

siddhantWhat is the cause of electrical force between charges?einstien explained curvature of spacetime for a gravitational field.but what abt the electrical field ?is it also due to a curvature?if so then curvature of what?a curvature in another dimension?what makes electromagnetic force stronger than gravitational force?

Parag VermaI just passed 10th standard, and I'll be preparing for JEE 2013. Pls tell me some good books to prepare from.... since you seem to have a better understanding of books

arindam royanirudh what you say might be correct......but tell me one thing?? Even if i get a wrong notion of a concept or two......and still get selected on iit jee due to those books.....what the hell is the problem with that?? I mean......no iitjee aspirant is gonna do a phd in physics.....be practical bossy.....i m a plus two student....and all i want is a rank in iitjee....like any other student in my locality...the current system of iitjee has converted students to machines....and if its fetching you seventy thousand a month.... What is the problem with that?? Its just my practical viewpoint....nothing else...

BPstrongly wishing to have known this earlier :( ...

Can the author describe the better way of learning physics??

Gaurav TambaDitched HCV for reading after starting electrostatics in school, still do problems from it though. Pretty satisfied with Resnick/Halliday/Walker for the moment, if you know a better textbook for concepts please do share.

Also I'm curious but those conversations you've posted, are they real or just your speculations?

AnirudhThe conversations are only figments of imagination to drive the point home. There were pictures earlier to depict the discontinuities in the fields etc., . I deleted the Picasa Album and the transpire to have gone with them.

You could just stick on to the books you possess right now. I was fortunate enough to be taught by an excellent teacher who bequeathed this knowledge to me.

krishnavir singhi like that .your effort is marvallous.then which book u prefer to study????

Souvikhey u realy wrote awesum...i min catching d faullies of a famous book wid this confidence is realy worth saying.....bt der is a confusion wich i wud like to share wid u....

the SHM problem of dielectric...hcverma prb-68...

in dat question ur first arguement is corect dat der exist a frnging effect....bt after dat as u said abt the time varying charges on capacitor..i min v r supose to solve dat prob after the steady state is reached...

i min i am asking u because after reading ur blog i am realy confusd abt my concepts so i am asking u wether it vil correct if i solve in steay state..i am a repeater n preparing for iit jee....

plz do reply sir..

AnirudhSouvik : What I am trying to say is that the problem arises when people try to ask questions such as 'What is the velocity of the dielectric?' and so on.

And please don't get confused with the concepts . Just stick to whatever you know

Souvikthanks..dat mins wat i said was nt wrong....i min v can solve at assuming steady state has reachd

metallica fan no.1awsme man! I have a friend who was asking the same doubts in class ! And my sir looked at him lyk an ass!

Unknownawsme man! I have a friend who was asking the same doubts in class ! And my sir looked at him lyk an ass!

Unknownawsme man! I have a friend who was asking the same doubts in class ! And my sir looked at him lyk an ass!

K.C KarthikI dont quite agree with your assessment of Halliday, Resnick, Walker. The "plethora of unnecessary pictures" are meant to get your attention,teach you the physics associated with it, excite those who believe studying physics and trying to understand nature through it is pointless. That according to me is real learning!! What we do with Physics, that you have so ironically pointed out, is just blindly accept the concepts at hand, not thinking as to WHY its so and so, WHY NOT this or that. All we care about is getting to the summit of a Mount IIT. We don't pause to gape in awe of the grandeur of Physics, thats the reason why they are there!! That is the banality of our education system!! It is sad you have failed to understand this very important fact!! But, I agree with what you have to say on Russians!!

Ashu GuptaIs resnick halliday walker better than hcv or dc pandey,, my father urged me to buy it and i like it pretty much,, but my coaching cenetr says it is not such a great book than dcp and hcv,, can u answer my querry??

Preetam Bhowmickthis is bakchodi!!!!!

AyushWho said E' is normal to the surface is a result of coloumb's law?

Coulomb's law goes like this "The magnitude of the Electrostatics force of interaction between two point charges is directly proportional to the scalar multiplication of the magnitudes of charges and inversely proportional to the square of the distances between them." where the direction of field is mentioned? The authors you are talking are well renowned and their books are flawless.

AnirudhHAHA! Naive is the word I have for you. So, Force is a vector quantity, how would you give its direction?

Also, the author derives Gauss' law from Coloumb's law and some such shit.

Madhurjya RoyWow, this really caught my attention although it is old!

I am preparing for JEE and I appreciate Irodov too! I am using Irodov's Fundamentals of Physics and it is really of high standard! Could you suggest some book that would be good for theory and would have proper derivations?

PS unfortunately, I do not have such a great teacher!