Question

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

A. 15 volt
B. 30 volt
C. 14 volt
D. 18 volt

Answer 1

Correct Answer - C
(c ) Reading of voltmeter
`= E_(eq) = (E_(1) r_(2) + E_(2) r_(2))/(r_(1) + r_(2)) = (18 xx 1 + 12 xx 2)/(1 + 2) = 14 V`