Vacuum V/S medium for greatest coulomb force
Electricity and Magnetism
Level
pending
Two charges (any shape) are separated at a distance. The force between them when placed in vacuum is f2 . The force when a dielectric (of any shape) is placed between them is f1. Then which force is greater?
f1 can be greater
none of these
all of these
f2 always greater
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
1 solution
If we insert two charges in a medium the force decreases than in vacuum (since K is min for vacuum, K=1). But consider the case of a + and - charge separated at a distance and a dielectric is placed between them, then the +ve end of dipoles in medium turn to -ve charge and vice versa as in figure. This means that the medium exerts an additional pulling force on them towards each other. That means that the force of attraction between charges increases now! (When dielectric completely surrounds the charge i suppose that the net effect is the pulling of charges away from each other due to dipole formation in medium not in between them)