Question

A wire of resistance 4 ohm is drawn


(1) to twice it's original length


(2) to thrice it's original length


Calculate it's new resistance in each case

Answer 1

MARK IT AS A BRAINLIST ANSWER ..

Explanation:

As a wire gets longer its resistance increases, and as it gets thinner its resistance also increases because its cross sectional area decreases. Doubling the length will double the resistance, but the wire also must get thinner as it is stretched, because it will contain the same amount of metal in twice the length