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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A charge q is placed at the some distance along the axis of a uniformly charged disc of surface cahrge density σ. The flux due to the charge q through the disc is ϕ. The electric force on charge q exerted by the disc is

A charge q is placed at the some distance along the axis of a uniformly charged disc of surface cahrge density σ. The flux due to the charge q through the disc is ϕ. The electric force on charge q exerted by the disc is

Two concentric conducting thin spherical shells A and B having radii rA and rB ( rB > rA 0 are charged to Qa and -Qb (QB >QA) . The electrical field along a line (passing through the centre ) is