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Q.

A conducting sphere of radius 5 cm has an unknown charge. The electric field at 10 cm from the centre of the sphere is 1.8 × 103 NC-1. The net charge on the sphere is

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a

1.8 nC

b

2 nC

c

1 nC

d

1.5 nC

answer is B.

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Detailed Solution

The electric field at a distance 10 cm from the center of the sphere is 

kqr2=9×109q0.12=1.8×103

q=2×109 C

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