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Q.

When the length and area of cross-section both are doubled, then its resistance

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a

Will become four times

b

Will remain the same

c

Will be doubled

d

Will become half

answer is C.

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Detailed Solution

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R1lA,  R22l2Ai.e.,  R2lA  R1=R2

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When the length and area of cross-section both are doubled, then its resistance