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WAEC - Physics (1996 - No. 50)

The diagram above illustrates an isolated metal sphere carrying charge W in a medium whose permittivity is so. The magnitude of the electric field intensity at P can be expressed as
Q2/(4πεor2)
Q/(4πεor2)
Q/(4πεor)
Q2/(4πεor2)
Q/(4πεor) 2

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