In the following circuit, each cell has an e.m.f. of 5 V and an internal resistance of `0.2 Omega`. What is the reading of the ideal voltmeter V in volts ?

Options

A. 5V
B. 40V
C. 0 V
D. 35 V

Answer

C

Explanation

All the cells are in series.
Hence the total e.m.f. `=8xx5=40 V`
and total internal resistance `= 8xx0.2=1.6 Omega`
`therefore I=(40)/(1.6)=25 A`
and the reading of the ideal voltmeter= terminal voltage of the cell across which it is connected .

`V=E- Ir=5-25xx0.2=0 V`
The reading of the voltmeter is zero.