Question -
Which of the following statements is correct about the circuit shown in figure where 1 ohm and 0.5 ohm are the internal resistances of the 6 V and 12 V batteries respectively?
Options:
A .  The potential at point P is 6 V
B .  The potential at point Q is +0.5 V
C .  If a voltmeter is connected across the 6 V battery it will read 7 V
D .  If a voltmeter is connected across the 6 V battery it will read 5 V
Answer: Option C : C Total resistance = 4 + 1 + 0.5 + 0.5 = 6ohm Net voltage in the circuit is 6 V Current l=66=1A in the anticlockwise direction VPR=1×4=4V Since R is connected to earth VR=0 hence Vp=4V VSQ=0.5×1=0.5V S is at a higher potential than Q VQ=−0.5V Current is being forced into the 6 V battery in the opposite direction.Hence V6=E+lr=6+1X 1 = 7 V
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