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Q.

A negligibly small current is passed through a wire of length 15 m and uniform cross-section 6.0 x 10-7 m2. The measured resistance of the wire is 5.0 Ω. The resistivity of the material is :

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a

1.8 x 10-6 Ω-m

b

0.2 x 10-6 Ω-m

c

0.6 x 10-6 Ω-m

d

0.9 x 10-6 Ω-m

answer is B.

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R=ρlA⇒ρ=RAl
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