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Four condensers each of capacity 4 \mu F are connected as shown in the figure. If the potential difference between P and Q is 15 V, the energy stored in the system is

1. 2400 ergs
2. 1800 ergs
3. 3600 ergs
4. 5400 ergs

Correct answer: 1800 ergs

Solution

The network of four identical capacitors reduces to an equivalent capacitance that, with 15 V across P and Q, gives stored energy 1800 ergs. The energy is computed using U = \tfrac12 C_{eq}V^2 and converted into ergs.

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