In the given circuit, the voltmeter and the electric cell are ideal. Find the reading of the voltmetre

Options

A. `1 V`
B. `2 V`
C. `3 V`
D. none of these

Answer

A

Explanation

The electric current through ideal voltmeter is zero. According to the loop rule,
`E - 1 xx 1 - I - 1 xx I = 0` or `I = (E)/(2) = (2)/(2) = 1A
Reading of ther votlmeter is
`V_(A)-V_(B)=[1xxI]=[1xx1]=1 V`