Question

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

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

Solution

## The correct option is A The potential at P is -7.5 VAs, I=VR=(20−10)(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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