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

Options

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

Answer

3

Explanation

Reading of voltmeter `=(E_(1)/(r_(1))+(E_(2))/(r_(2)))/((1)/(r_(1))+(1)/(r_(2)))=(E_(1)r_(2)+E_(2)r_(1))/(r_(1)+r_(2))`
=14volt.