A capacitor is a device used in a variety of electronic circuits. In a simple de

Question

A capacitor is a device used in a variety of electronic circuits. In a simple design a capacitor consists of two parallel metal plates of area A separated by a distance d. When the plates are connected to the positive and negative terminals of a battery, electrons are pulled off one plate leaving it positively charged and transferred to the other plate, leaving this plate negatively charged. The capacity, C, of a parallel-plate capacitor is given by C = ?o A / d where ?o is the permittivity of free space. The charge, Q, stored on a capacitor (+Q on one plate and

Explanation / Answer

C`=C/2 charge should remain constant =>V should increase by 2 E=.5qV E`=2E C) the stored energy is doubled

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