Q.

If the capacity of a spherical conductor is 1 picofarad, then its diameter, would be

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a

1.8×10−3m

b

18×10−3m

c

1.8×10−5m

d

18×10−7m

answer is B.

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Detailed Solution

C=4πε0RR=C4πε0=9×109×10−12=9×10−3m Diameter =2R=2×9×10−3=18×10−3m
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If the capacity of a spherical conductor is 1 picofarad, then its diameter, would be