2.11 A 600pF capacitor is charged by a 200V supply. It is then disconnected from the supply and is connected to another uncharged 600 pF capacitor. How much electrostatic energy is lost in the process?
2.11 A 600pF capacitor is charged by a 200V supply. It is then disconnected from the supply and is connected to another uncharged 600 pF capacitor. How much electrostatic energy is lost in the process?
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1 Answer
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2.11 Capacitance of the first capacitor, C = 600 pF = 600 F
Potential difference, V = 200V
Electrostatic energy of the first capacitor, = C = 600 J
= 1.2 J
After the supply is disconnected and the first capacitor is connected to another capacitor of 600 pF capacitance in series, the equivalent capacitance is given by
= + = + =
New electrostatic energy, = = = 6 J
Electrostatic energy lost = = 1.2 6 = 6 J
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