Question: A system consists of two concentric conducting spheres, with the inside sphere of radius a carrying a positive charge ql. What charge q2 has to

A system consists of two concentric conducting spheres, with the inside sphere of radius a carrying a positive charge ql. What charge q2 has to be deposited on the outside sphere of radius b to reduce the potential of the inside sphere to zero? How does the potential φ depend in this case on a distance r from the centre of the system? Draw the approximate plot of this dependence.

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