Question: A spherical capacitor contains a charge of 3.30 nC when connected to a potential difference of 220 V. If its plates are separated by vacuum

A spherical capacitor contains a charge of 3.30 nC when connected to a potential difference of 220 V. If its plates are separated by vacuum and the inner radius of the outer shell is 4.00 cm, calculate:
(a) The capacitance;
(b) The radius of the inner sphere;
(c) The electric field just outside the surface of the inner sphere.

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