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  4. Four condensers each of capacity 4 μ F are connected as shown in figure. Given that VP-VQ=15 volts . The energy stored in the system is

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Q. Four condensers each of capacity $4\, \mu F$ are connected as shown in figure. Given that $V_{P}-V_{Q}=15$ volts . The energy stored in the system isPhysics Question Image

Electrostatic Potential and Capacitance

Solution:

Total capacitance of given system, $C_{e q}=\frac{8}{5} \mu F$
$U=\frac{1}{2} C_{e q} V^{2}=\frac{1}{2} \times \frac{8}{5} \times 10^{-6} \times 225$
$=180 \times 10^{-6} J$
$=180 \times 10^{-6} \times 10^{7} erg =1800\, erg$