A conducting sphere of radius 0.01m has a charge of 1.0 x 10−9C deposited on it. Taking the k as 9 x 109 Nm2/C2, the magnitude of the electric field in N / C just outside the surface of the sphere is:
a. 180000
b. 4500
c. 0
d. 90000
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answer of this question is C
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