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SammyS
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The spheres are conductors.Pranav-Arora said:I honestly don't see it. I tried writing down the equations to see if placing the extra charge at centre makes the surface of sphere equipotential.
The magnitude of extra charge is same as the induced charge. If this charge is placed at the centre of sphere, the potential due to it on the surface of sphere is ##kq/R## where ##q=QR/d##.
If I consider a point on the sphere and find the net potential due to these two charges, it comes out to be different for different positions of the point under consideration on the surface of sphere.