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 Main Online Paper (Held On 10 April 2015)

A)  11.9 V                  

B)  13.1 V

C)  12.5 V                  

D)  24.5 V

Correct Answer: B

Solution :

                 \[i=\frac{5}{1.6}\]           \[=\frac{50}{16}=\frac{25}{8}Amp\] \[V=15-\frac{25}{8}\times 0.6\] \[=15-\frac{15}{8}\] \[=13.1\]volt