Q.

Two batteries, one of e.m.f. 18 volt and internal resistance 2Ω and the other of e.m.f. 12 volt and internal resistance 1C) are connected as shown in fig, The voltmeter V will record a reading of

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a

7v

b

14 v

c

18 v

d

30 v

answer is B.

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Detailed Solution

The voltmeter reading V is given by V=E1/r1+E2/r21/r1+1/r2=(18/2)+(12/1)(1/2)+(1/1)=14 volt.
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Two batteries, one of e.m.f. 18 volt and internal resistance 2Ω and the other of e.m.f. 12 volt and internal resistance 1C) are connected as shown in fig, The voltmeter V will record a reading of