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Question

For the circuit shown, which of the following is incorrect?


Correct Answer
A
The potential at P is -7.5 V
Your Answer
B
The potential at Q is -1 V
Your Answer
C
The potential at R is zero
Your Answer
D
The potential at S is zero

Solution

The correct option is A The potential at P is -7.5 V
As, I=VR=(2010)(7.5+0.5+1+1)=1AVPS=7.5×1=7.5V,VQR=1×1V
G is connected to earth, hence potentials of R and S is zero. Direction of current is from P to S.
VP=7.5V
Similarly VQ=1V
 

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