A 10V battery with internal resistance 1ohm and a 15V battery with internal resistance 0.6ohm are connected in
parallel to a voltmeter (see figure). The reading in the voltmeter will be close to
a) 11.9 V
b) 13.1 V
c) 12.5 V
d) 24.5 V

Question

A 10V battery with internal resistance 1ohm and a 15V battery with
internal resistance 0 6ohm are connected in
parallel to a voltmeter (see figure) The reading in the voltmeter
will be close to
a) 11 9 V
b) 13 1 V
c) 12 5 V
d) 24 5 V

​

Ved Prakash Lakhera · Accepted Answer

The potential according to given circuit diagram is as followsThe net resistance is given by;     1R=1+106=166or     R=38ohmThe net potential V=15-10=5VoltTherefore  the current I=VR=5×83=13
3ATherefore potential across voltmeter=13
3×1=13
3VoltSo the approximate correct answer is option b 13
1V

A 10V battery with internal resistance 1ohm and a 15V battery with internal resistance 0.6ohm are connected in parallel to a voltmeter (see figure). The reading in the voltmeter will be close to a) 11.9 V b) 13.1 V c) 12.5 V d) 24.5 V ​

A 10V battery with internal resistance 1ohm and a 15V battery with internal resistance 0.6ohm are connected in
parallel to a voltmeter (see figure). The reading in the voltmeter will be close to
a) 11.9 V
b) 13.1 V
c) 12.5 V
d) 24.5 V