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Q.

In the following circuit all capacitors have same capacitance; then the potentials at points A and B are 
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a

10V, 0V

b

5V, -5V

c

6 V, -4V

d

4V, -6V

answer is B.

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Detailed Solution

Charges on each capacitor plates is same , so PD across is also same. Across each capacitor
PD = (10/2 ) = 2V ; A is 3×2 =6V higher than earth (zero).
B is 2 × 2 = 4V less potential than earth so it is at –4V.

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In the following circuit all capacitors have same capacitance; then the potentials at points A and B are