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Two capacitors of 10 PF and 20 PF are co...

Two capacitors of 10 PF and 20 PF are connected to 200 V and 100 V sources respectively. If they are connected by the wire, what is the common potential of the capacitors ?

A

300 volt

B

133.3 volt

C

400 volt

D

150 volt

Text Solution

Verified by Experts

The correct Answer is:
B
Common potential,
`V=(C_(1)V_(1)+C_(2)V_(2))/(C_(1)+C_(2))`
Here, `C_(1)=10PF, V_(1)=200V`
`C_(2)=20PF, V_(2)=100V`
`:.V=(10xx200+20xx100)/(10+20)=(4000)/(30)V=133.3V`
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