A parallel-plate air capacitor has plate area A and separation d. Switch S is closed to connect the capacitor to a cell of emf V. Select the correct statements.

Question

G1 Physics · Accepted Answer

At fixed battery voltage, Q=CV and U=½CV². The charging heat is ½CV². The source figure states the plate-force expression in option B without the factor 1/2, so B is false; slow reduction d→d/2 gives W(ext)=-½CV² and no dissipative loss. Thus A,C,D.