Question

Length of a wire and its cross sectional area is doubled. What is the change in its resistivity ?

Answer 1

Answer:

As we know,

Resistance is directly proportional to the length of the wire and inversely proportional to the area of cross-section of the wire.

If length is doubled,

2R=2l

If the area is doubled,

R = 1/2A

Hence, there will be no change in resistance.

Explanation:

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Answer 2

Answer:

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Explanation:

Resistance is directly proportional to the length of the wire and inversely proportional to the area of cross-section of the wire. Hence, there will be no change in resistance.