Q.

The dielectric strength of air at NTP is 3×106 V​/m then the maximum charge that can be given to a spherical conductor of radius 3 m is

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a

3×10−4C

b

3×10−3C

c

3×10−2C

d

3×10−1C

answer is B.

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Detailed Solution

By using E=9×109×QR2⇒3×106=9×109×Q(3)2⇒Q=3×10−3C
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