Question

An uncharged conducting rectangular shell is placed between two charged plates. Where is the electric field zero? (a) only at point a (b)at points a and c (c) at points b and d (d)only at point d

Answer 1

When a metal is placed inside an external field then charges are induced on the outer surface of metal such that an internal electric field is produced inside the metal which cancels the external electric field inside the metal.

In the above figure we can see that opposite charges are induced on the outer surface of conducting shell these induced charges cancelled out the effect of external field produced by two opposite charged plates so inside the shell electric field is zero.Since point b and d both lies inside the conducting shell.So at these points electric field is zero.

So option(C) at points b and d.....is correct.