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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A thin spherical conducting shell of radius R has a charge q. Another charge Q is placed at the centre of the shell. The electrostatic potential at a point P a distance R2 from the centre of the shell is

A thin spherical conducting shell of radius R has a charge q. Another charge Q is placed at the centre of the shell. The electrostatic potential at a point P a distance R2 from the centre of the shell is

Three equal charges Q are placed at the vertices of an equilateral triangle. What should be the value of a charge that when placed at the centroid reduces the interaction energy of the system to zero.