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Question

In the circuit shown, the cell is ideal, with emf = 15 V. Each resistor is of 3 Ω. The potential difference across the capacitor is :
126567_d14c2ecfdb8e4bb1b9e9f8a391ee74c8.png

A
0
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B
9 V
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C
12 V
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D
15 V
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Solution

The correct option is C 12 V
In the steady state capacitor is fully charged so no current will flow through resistor on most right resistor.
By Kirchhoff's law for loop ABCEFA and CHGEC, we will get
3i1+3(i1+i2)=152i1+i2=5...(1) and
3i2+3i23i1=0i1=2i2...(2)
From (1) and (2), 5i2=5i2=1 and i1=2
Thus potential across capacitor =3i2+3(i1+i2)=3+9=12V

245988_126567_ans_871ad8c74f4f4428a4582b9ec55711d8.png

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