Two batteries, one of emf 18 volts and internal resistance $2 \Omega$ and the other of emf 12 volts and…
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 of:
30 volt
18 volt
15 volt
14 volt
Solution
Reading of voltmeter
$=\frac{\frac{E_1}{r_1}+\frac{E_2}{r_2}}{\frac{1}{r_1}+\frac{1}{r_2}}=\frac{E_1 r_2+E_2 r_1}{r_1+r_2}$
Putting value we get 14 volt.
