Answer to Question #138827 in Electricity and Magnetism for Rohan

Question #138827

A copper block is placed somewhere and is given a charge Q. The surface charge density on the block and the electric field at a given external point are noted. Now this block is replaced by an aluminium block of the same shape and size and it is given the same charge Q.

(a) The surface charge density at a point on the copper block is more than that at the corresponding point on the aluminium block.

(b) The surface charge density at a point on the copper block is less than that at the corresponding point on the aluminium block.

(c) The surface charge density at a point on the copper block is the same as that at the corresponding point on the aluminium block.

(d) The electric field at the given external point is the same in the two situations.

(Note:- This question have one or more than one correct choice(s) out of the four given choices. Any number of options may be correct.)

Expert's answer

Answer. (c) and (d)

(c) The surface charge density at a point on the copper block is the same as that at the corresponding point on the aluminium block.

(d) The electric field at the given external point is the same in the two situations.