Question

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

Answer 1

Resistance increases with the increase in length as it is directly proportional to length

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 cross-sectional area.

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

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