The insulation property of air breaks down at E=3×106Volts/metre. The maximum charge that can be given to a sphere a diameter 5m is approximately (in coulomb)
2×10−2
2×10−3
2×10−4
2×10−5
A
2×10−4
B
2×10−3
C
2×10−5
D
2×10−2
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Solution
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Maximum Electric field , E=14πϵ0Qr2=3×106 r=52=2.5 ∴Q=4πϵ0r2E=3×106×6.259×109=2×10−3C
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