Question

How will the resistance of a wire change if it's diameter is doubled, it's length remaining the same​

Answer 1

Explanation:

(i)When length is doubled,thr original resistance R becomes 2R,i.e.,the resistance also doubles. (ii)When diameter is doubled,the area of the wire becomes 4 times the original area. Hence new resistance becomes 1/4th of original R;since R is inversely related to the area A.