Two batteries, one of emf 18 volt and internalresistance

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Two batteries, one of emf 18 volt and internal

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

1. 30 volt
2. 18 volt
3. 15 volt
4. 14 volt

Correct Option: D

(Since the cells are in parallel).