A parallel-plate capacitor is connected with wires of negligible resistance to a…

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

100. A parallel-plate capacitor is connected with wires of negligible resistance to a battery having emf E\boldsymbol{\mathcal { E }} until the capacitor is fully charged. The battery is then disconnected from the circuit and the plates of the capacitor are moved to half of their original separation using insulated gloves. Let Vnew \mathrm{V}_{\text {new }} be the potential difference across the capacitor plates when the plates are moved together. Let Vold \mathrm{V}_{\text {old }} be the potential difference across the capacitor plates when connected to the battery. Vnew Vold =\frac{\mathrm{V}_{\text {new }}}{\mathrm{V}_{\text {old }}}= (A) 12\frac{1}{2} (B) 1 (C) 2 (D) 4

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