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Explain the working principle of a parallel plate capacitor. |
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Answer» Solution :To understand the principle of a capacitor consider an insulated conductor plate A and give charge Q to it [Fig. ] so that it acquires a POTENTIAL `V_1`. Now bring another metallic plate B of same SIZE near A. As shown in Fig. equal amount of -ve and +vecharges are induced on plate B.Induced + ve charge on B tends to raise the potential of plate A but induced – ve charge tends to lower the potential of A. HOWEVER, if plate B is EARTHED [Fig.] then induced positive charge, being free, passes to earth. Now due to - ve charge of B electric potential of A is lowered by a large VALUE to V (say) and consequently its capacitance is raised appreciably. It is the basic principle of a capacitor. 
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