Two batteries, one of emf 18 volt and internal resistance 2 Ω and the other of emf 12 volt and internal resistance 1Ω, are connected as shown. The voltmeter V will record a reading of :
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a
18 volt
b
30 volt
c
14 volt
d
15 volt
answer is C.
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Detailed Solution
Reading of voltmeter = E1r1+E2r21r1+1r2=E1r2+E2r1r1+r2=14 volt