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Q.

The specific resistance of the material of a wire is ’ ρ’ and its volume is 3m3 and its resistance is 3Ω . The length of the wire will be

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a

1ρ

b

3ρ

c

3ρ

d

ρ3

answer is B.

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Detailed Solution

R=ρlA;V=Axl;A=Vl;l=RAρ=RVρll2=RVρ;l=RVρ=3×3ρ=3ρ

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The specific resistance of the material of a wire is ’ ρ’ and its volume is 3m3 and its resistance is 3Ω . The length of the wire will be