A point charge q is placed at a distance 2r from the centre o of a conducting charged sphere of radius r. due to the induced charges on the sphere, find the electric potential at point p on the surface of sphere (in volt) (if kq/r = 18 volt).
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the net potential at the center = potential due to surface charge + potential due to point charge
the net potential at the center = Kqr+Kq2r
but potential due to surface charge = 0
the net potential at the center = 0+182=9v where [Kqr=18]