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Question

At a point due to a point charge, the values of electric field intensity and potential are 32 NC1 and 16 J C1 ,respectively. Calculate the

a. magnitude of the charge,and

b. distance of the charge from the point of observation.

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Solution

If r is the distance of the charge Q from the point of observation, then

E=14πε0Qr2=32 (i)

and V=14πε0Qr=16 (ii)

Dividing Eq (ii) br Eq. (i), we get r = 0.5m and putting the value of r in Eq. (ii), we get

Q=16×0.59×109=(8/9)×109C


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