39) A circuit which is used for charging a battery is shown in the adjacent figure. The battery of 'B' has emf 6 V and internal resistance of 2 ohm. The charging battery 'A' has an emf of 9 V and internal resistance of 1 ohm. The voltage across the points P and Q.
(A) 8 V
(B) 7 V
(C) 4 V
(D) 4.2 V

Dear student,Net voltage=9-6=3Vnet resistance=2+1=3ohmNet current flowing=33=1Apd across PQ=9-2×1=7VRegards

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