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Two spherical cavities of radii a and b ...

Two spherical cavities of radii `a` and `b` are hollowed out from the interior of a neutral conducting sphere of radius `R`. At the center of each cavity , a point charge is placed . Call these charges `q_(a)` and `q_(b)`.
The electric field inside the cavity of radius `a` at a distance `r` from the center of cavity is

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