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I posted this to some forum and got response , can somebody explain.

I think that when a charge system is put in a medium then the medium gets induced and exert force on the particle (test charge) thus net force is vector sum of forces by both medium and charge. this way force in particle due to charge should remain unaffected. correct me if I am wrong

 Answer was

The actual interaction between two charged particles through the exchange of photons which is a carrier of electromagnetic force. Your view is very very classical.

Note by Kushal Patankar
4 years, 5 months ago

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I am confused with respect to this too. Consider this problem:

  1. Two identical point charges are kept 1mm distance apart and the electrostatic force between them is measured as F1F_1. Now a thin(thickness1mm\approx 1mm) plastic sheet is introduced in the space between the charges. The force is measured again and found to be F2F_2. Then:

A. F1>F2F_1>F_2

B. F1<F2F_1<F_2

C. F1=F2F_1=F_2

D. Depends on nature of plastic.

If I remember right, the answer is AA... But I thought it was CC, no idea how to explain it.

Raghav Vaidyanathan - 4 years, 5 months ago

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The answer must be C the plastic between the doesn't affect the charges since it is neutral.

Have you attended the counseling of IISC Raghav

Ronak Agarwal - 4 years, 5 months ago

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no, if it was a dielectric effect will be there, (unless it was negligibly thin) (or sheet was infinitely large)

think about it , the dipoles will align themselves as per electric field which is non uniform in magnitude (let us assume it is made of dipoles)

then, at all intermediate points, the positive and negative ends of adjacent dipoles will cancel each other (overlap) (like two barmagnets joined together) whereas at the boundary on either side, there will be excesss charge (like the poles)

(however, in the capacitor dielectric we deal with , the thing is so large and hence electric field is nearly independent of distance for each charged side σϵ \frac {\sigma}{\epsilon} _

Mvs Saketh - 4 years, 5 months ago

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What if it was a dielectric?

Raghav Vaidyanathan - 4 years, 5 months ago

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@Raghav Vaidyanathan I think, it would affect the force between them if the sheet was a dielectric.

Kushal Patankar - 4 years, 5 months ago

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@Raghav Vaidyanathan Even if the sheet was dielectric then also it would have no effect. Actually the charges must be inside the dielectric for some effect to take place

Ronak Agarwal - 4 years, 5 months ago

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No, I did not go. They also allowed me to attend in July. But they haven't given any other information. Is that what they told you too?

Raghav Vaidyanathan - 4 years, 5 months ago

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@Raghav Vaidyanathan Yes, that's what they told me too. But now when we have to pay fees for IISC

Ronak Agarwal - 4 years, 5 months ago

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@Ronak Agarwal I don't know when we have to pay the fees. They haven't mentioned anything about it in the mail. My father sent them a mail regarding the fee payment, they have not replied yet.

Raghav Vaidyanathan - 4 years, 5 months ago

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