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Q.

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

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a

3 x 10-7 ohm

b

3 x 10-9 ohm

c

3 x 10-5 ohm

d

3 x 10-3 ohm

answer is B.

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Detailed Solution

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Between rectangular faces l = 1 cm,
A=100cm2,R=ρlAR=3×10−7×1100×10−2=3×10−7ohm

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