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Question

The specific resistance of a wire is ρ, its volume is 3m3 and its resistance is 3ohms, then its length will be


Your Answer
A
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B
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C
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D

Solution

The correct option is A

Volumn = Al=3  A=3l
Now R=ρlA 3=ρ× l3/l=ρl23 l2=9ρ=3ρ

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