Question

A uniform resistance wire is stretched till its length becomes four times. What happens to resistance?

Answer 1

Answer:

16 times

Explanation:

the new resistance becomes 16 times from the resistance before stretching it

Answer 2

Answer:

Resistance increases by 16 times.

As resistance is directly proportional to the length of the wire, resistance increases by 4 times. And if the wire is stretched it's cross sectional area is decreased by 4 times as resistance is inversely proportional to the cross- sectional area.

Then, the resistance is increased by 4×4 times i.e. 16 times.