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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A solid sphere of radius ‘R’ has a cavity of radius R2. The solid part has a uniform charge density ‘ρ’ and cavity has no charge. Find the electric potential at point ‘A’. Also find the electric field (only magnitude) at point ‘C’ inside the cavity

A solid sphere of radius ‘R’ has a cavity of radius R2. The solid part has a uniform charge density ‘ρ’ and cavity has no charge. Find the electric potential at point ‘A’. Also find the electric field (only magnitude) at point ‘C’ inside the cavity

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.