question_answer

A 10V battery with internal resistance \[1\Omega \]and a 15 V battery with internal resistance \[0.6\Omega \] are connected in parallel to a voltmeter (see figure). The reading in the voltmeter will be close to: [JEE ONLINE 10-04-2015]

A) 11.9 V

B) 13.1 V

C) 12.5 V

D) 24.5 V

Correct Answer: B

Solution :

[b] \[i=\frac{5}{1.6}\]          \[=\frac{50}{16}=\frac{25}{8}Amp\]

\[V=15-\frac{25}{8}\times 0.6\] \[=15-\frac{15}{8}\] \[=13.1\]volt