Question

Two batteries,one of emf 18 V and internal resistance 2Ω and the other of emf 12 V and internal resistance 1Ω, are connected as shown.The voltmeter V will record a reading of :

• A. 7 V
• B. 21 V
• C. 14 V
• D. 28 V

Answer 1

Answer: (C)

14 V

Answer 2

Here the batteries are connected in parallel,
so V=$\frac{E_1r_2+E_2r_1}{r_1+r_2}$
=$\frac{18\times1+12\times2}{1+2}$
V=14 Volt