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Question

Two capacitors of capacitance 15μF and 20μF are connected in series to a 600V direct current supply. Charge on each capacitor and potential difference across 15μF capacitor are respectively.

A
5.14×103C,342.8V
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B
5.14×106C,340V
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C
340V,5.14×103C
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D
5.14×105C,340V
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Solution

The correct option is A 5.14×103C,342.8V
Given,

C1=15μF

C2=20μF

V=600v

The two capacitors are connected in series, then the equivalent capacitance is

Ceq=C1C2C1+C2=15×2015+20μF

Ceq=8.571μF

In series combination, Charge on each capacitance is same, but different
potential difference.

Q=CeqV=8.571×600=5.142×103C

The potential difference across 15μF

V1=QC1=5.142×10315×106=342.8V

The correct option is A.

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