The dielectric strength in air is 3×106Vm−1. Charge to be given to a conducting sphere of radius 2m is :
1.33×10−3C
2.66×10−3C
3×10−3C
infinite
A
3×10−3C
B
2.66×10−3C
C
infinite
D
1.33×10−3C
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Solution
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Considering that the charge is Q. The dielectric strength of air is given. The maximum charge which can be given without ionising the air around it is given by, E=kQ/r2 3×106=9×109×Q/4 Q=1.33×10−3C
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