question_answer

Direction: Q.41 to Q.45

An arrangement of two conductors separated by an insulating medium can be used to store electric charge and electric energy. Such a system is called a capacitor. The more charge a capacitor can store, the greater is its capacitance. Usually, a capacitor consists of two conductors having equal and opposite charge +Q and -Q.

Hence, there is a potential difference V between them. By the capacitance of a capacitor, we mean the ratio of the charge Q to the potential difference V. By the charge on a capacitor we mean only the charge Q on the positive plate. Total charge of the capacitor is zero. The capacitance of a capacitor is a constant and depends on geometric factors, such as the shape, size and relative position of the two conductors, and the nature of the medium between them. The unit of capacitance is farad (F), but the more convenient units are \[\mu F\]and pF. A commonly used capacitor consists of two long strips or metal foils, separated by two long strips of dielectrics, rolled up into a small cylinder. Common dielectric materials are plastics (such as polyesters and polycarbonates) and aluminium oxide. Capacitors are widely used in television, computer, and other electric circuits.

Read the given passage carefully and give the answer of the following questions.

A parallel plate capacitor C has a charge Q/2. The actual charges on its plates are:

A) 0.0                               

B) \[Q/2,\,Q/2\]

C) \[Q,-Q\]                        

D) \[Q/2,-Q/2\]