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  4. Two batteries, one of emf 18 volts and internal resistance 2 Ω and the other of emf 12 volts and internal resistance 1 Ω are connected as shown. The voltmeter V will record a reading of

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Q. Two batteries, one of emf $18$ volts and internal resistance $2\, \Omega$ and the other of emf $12$ volts and internal resistance $1\, \Omega$ are connected as shown. The voltmeter $V$ will record a reading ofPhysics Question Image

AIPMTAIPMT 2005Current Electricity

Solution:

Since, the batteries are connected in parallel,
$V =\frac{ E _{1} r _{2}+ E _{2} r _{1}}{ r _{1}+ r _{2}}$
$V =\frac{18 \times 1+12 \times 2}{1+2}$
$V =14 \,V $ olt