Question

two point charges when separated by a distance in air repel by a force of 100N. When these charges are now placed in a medium of dielectric constant 20, find the new force.

Answer 1

Answer:

F=20*100=200 N

Explanation:

when a medium of dielectric is placed then the force increases respectively.

Answer 2

answer : new force would be 5N

let q₁ and q₂ are two charges when seperated by a distance r in air repel by a force of 100N.

F = 100 = kq₁q₂/r² ..........(1)

a/c to question, when these charges are now placed in a medium of dielectric constant, d = 20.

F' = kq₁q₂/dr² = F/d

from equation (1) we get,

F' = 100/20 = 5N

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