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Question

The capacitance of a spherical condenser is 1mF. If the spacing between the two spheres is 1mm, then the radius of the outer space is

A
30cm
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B
6m
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C
5cm
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D
3m
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Solution

The correct option is D 3m
C=4πE0(1ri)(1r0).....................(1)Accordingtothequestion:r0r1=0.001mC=0.000001F..............(2)Putting(2)in(1)r20r0(0.001)(9×000000000×0.000000001)=0thereforer0=3m

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