A point charge q is placed at a distance 2r from the centre O of a conducting charged sphere of radius r. due to induced charges on the sphere , find the elecric potential at point P on the surface of sphere in volt if kq/r =18V.

Hi. As the electric field inside a conductor is zero. The electrostatic potential is constant inside it. The potential at centre will be the potential of entire conductor. The entire charge of conductor is on surface. Note that despite induced charges, net charge will be zero. Thus the net potential at centre is kQ/r (due to surface charge) + kq/2r (due to the point charge) Q=0Thus potential is kq/2r= 9 Volts

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. The electrostatic potential is constant inside it asthe electric field inside a conductor is zero.The potential at centre will be the potential of entire conductor. The entire charge of conductor is on surface.
Note that despite induced charges, net charge will be zero. Thus the net potential at centre is kQ/r (due to surface charge) + kq/2r (due to the point charge) Q=0Thus potential is kq/2r= 9 Volts


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