Q.

Dimensions of a block are 1 cm x 1cm x 100cm. If specific resistance of its material is 3 x 10-7 ohm-m, then the resistance between the opposite rectangular faces is:

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a

3 x 10-5 ohm-m

b

3 x 10-3 ohm-m

c

3 x 10-7 ohm-m

d

3 x 10-9 ohm-m

answer is B.

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Detailed Solution

l = 1cm, A = 100cm2
R=ρℓA=3×107×1×102100×104=3×107ΩR=3×107Ω

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