wo spherical cavities, of radii a and b, are hollowed out from the interior of a (neutral) conducting sphere of radius R (see attatched image). At the center of each cavity a point charge is placed. Call these charges qa and qb. What is the field outside the conductor and what is the field within each cavity?

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.