Dimensions of a block are 1 cm x 1 cm x 100 cm. If specific resistance of its material is 3 × 10−7 ohm-m, then the resistance between the opposite rectangular faces is
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a
3 × 10−9 ohm
b
3 × 10−7 ohm
c
3 × 10−5 ohm
d
3 × 10−3 ohm
answer is B.
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Detailed Solution
Length l=1 cm=10−2mArea of cross-section A = 1 cm x 100 cm=100 cm2=10−2m2Resistance R=3 × 10−7 × 10−210−2 = 3 × 10−7 Ω