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Q.

In the figure below, what is the potential difference between the point A and B and between B and C respectively in steady state   

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a

VAB=75 V, VBC=25 V

b

VAB=25 V ,VBC=75 V

c

VAB=VBC=50 V

d

VAB=VBC=100V

answer is C.

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Detailed Solution

{C_{eq}} = \frac{{(3 + 3) \times (1 + 1)}}{{(3 + 3) + (1 + 1)}} + 1 = \left( {\frac{{6 \times 2}}{{6 + 2}}} \right)\, + 1

= \frac{5}{2}\mu F

\therefore Q=C \times V = \frac{5}{2} \times 100 = 250\mu C

Charge in 6μF branch = VC = \left( {\frac{{6 \times 2}}{{6 + 2}}} \right)\,100 = 150\mu C

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{V_{AB}} = \frac{{150}}{6} = 25\,V\,and\,\,{V_{BC}} = 100 - {V_{AB}} = 75\,V

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