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Question

If length of a wire is doubled and its cross-section is also doubled, then the resistance will

A
increase 8 times
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B
decrease 4 times
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C
become 4 times
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D
remain unchanged
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Solution

The correct option is D remain unchanged
Since the increase in length cancels out the increase in cross sectional area, The resistance remains unchanged.
Resistance=ρLA
Here ρ is the resistivity of the wire.

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