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Q.

A metal wire of specific resistance 64×10−8 Ωm  and length 1.98 m has a resistance of 7 Ω . Find its radius

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a

1.4×10−4 m

b

2.4×10−4 m

c

0.4×10−4 m

d

2×10−4 m

answer is B.

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Detailed Solution

As R=ρlA=ρlπr2

r2=ρlπR=64×10−8×1.98×722×7

r2=5.76×10−8 m2

r=2.4×10−4 m

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