MHT CET 2026 Physics question
A parallel plate capacitor of capacitance 'C' is connected to a battery and charged to a potential 'V'. Another capacitor of capacitance '3C' is charged to a potential '3V'. The charging battery is then disconnected and both the capacitors are connected in parallel to each other such that positive terminal of one is connected to negative terminal of the other. The final energy of the configuration is
Solution
Initial charges: on the first capacitor and on the second. They are joined with opposite polarities (positive to negative), so the net charge is the difference: . The capacitors are now in parallel, so the equivalent capacitance is and the common
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