In the circuit shown there is steady state with the switch closed. The switch is opened at t=0. Choose the correct option(s). (Given : ε=24V,C1=3F and C2=2F)
A
The voltage across C1 before the switch is open is 12V.
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B
The voltage across C1 after the switch is open for a long time is 12V.
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C
The voltage across C2 after the switch is open for a long time is 24V.
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D
The voltage across C2 before the switch is open is 8V.
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Solution
The correct option is D The voltage across C2 before the switch is open is 8V. In steady state before opening the switch, Req=18Ω ε=24V i=εReq=2418=43A
Potential difference across capacitor C1 is V1=43×9=12V
Potential difference across capacitor C2 is V2=43×6=8V
After opening the switch and waiting for a long time, V2=V1=24V