Q.

A conducting sphere of radius 0.5 m is placed in a medium of dielectric strength2.7×106 V/m . The quantity of charge it cannot hold is

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a

50 μC

b

20 μC

c

30 μC

d

90 μC

answer is D.

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Detailed Solution

‘Q’ be the max. charge that the sphere can hold, then14πε0Qr2=2.7×106 9×109×Q0.52=2.7×106 Q=0.675×10-3C=67μC
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A conducting sphere of radius 0.5 m is placed in a medium of dielectric strength2.7×106 V/m . The quantity of charge it cannot hold is