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A conducting sphere of radius 10 cm has ...

A conducting sphere of radius 10 cm has an unknown charge. If the electric field 20 cm from the centre of the sphere is `1.5xx10^(3) N//C` and points radially inward, what is the net charge on the sphere?

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`(a) - 30nC, (b) 0.24 mu C//m^(2)`
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