Question

How does the resistance of a wire change when:

If length is tripled?

If area of cross section is doubled?
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Answer 1

Explanation:

as we know that resistance is directly proportional to the length so when the the length is tripled the resistance I will also get three times

and we know that the area of cross-section is inversely proportional to the resistance so when the area is doubled the resistance will get half

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Answer 2

The resistance of a wire is directly proportional to its length and inversely proportional to its area (or square of inverse of diameter).

As per basic equation of resistance, value of resistance is directly proportional to length & inversely proportional to area. Hence if both length & cross-sectional area are doubled the value of resistance will remain the same as that of earlier value.