Two batteries, one of emf $18\,volts\;emf$ and internal resistance $2\,\Omega $ and the other of emf $12\, volt$ and internal resistance $1\,\Omega $, are connected as shown. The voltmeter $V$ will record a reading of .............. $volt$
AIPMT 2005, Easy
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Reading of voltmeter
$ = {E_{eq}} = \frac{{{E_1}{r_2} + {E_2}{r_1}}}{{{r_1} + {r_2}}} = \frac{{18 \times 1 + 12 \times 2}}{{1 + 2}} = 14\,V$
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