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

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1ρ

3ρ

1ρ 3

ρ13

answer is D.

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Detailed Solution

Volume =Al=3 ⇒ A=3lNow R= ρ lA ⇒3=ρ × l3/l=ρl23 ⇒ l2 = 9ρ=3ρ

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