Q.
When the length and area of cross-section both are doubled, then its resistance
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a
Will become half
b
Will be doubled
c
Will remain the same
d
Will become four times
answer is C.
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Detailed Solution
R1 ∝ lA, R2 ∝ 2l2A i.e., R1 ∝ lA∴ R1 = R2
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