Question

If a wire is stretched, so that its length is 20% more
than its initial length, the percentage increase in
the resistance of the wire is :-
(1) 40%
(2) 10%
(3) 44%
(4) 25%​

Answer 1

Answer:

25 percent

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

Answer 2

Answer:

25 ,percent

Explanation:

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