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Questions  

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 

a
7v
b
14 v
c
18 v
d
30 v

detailed solution

Correct option is B

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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