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Q.

The insulation property of air, breaks at E = 3 x 106 N /C. The maximum charge that can be given to a sphere of diameter 5 metre is approximately (in coulomb) :

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a

2 x 10-2

b

2 x 10-3

c

2 x 10-4

d

2 x 10-5

answer is B.

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Detailed Solution

R=2.5m  E=14πε0qr2, ∴q=2x10-3C
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The insulation property of air, breaks at E = 3 x 106 N /C. The maximum charge that can be given to a sphere of diameter 5 metre is approximately (in coulomb) :