What is the reading of ammeter is adjoining circuit diagram.

Options

A. 1
B. `(1)/(2)`
C. `(2)/(3)`
D. 3

Answer

3

Explanation

Redraw the circuit

Equalent emf of two cells in branches other then A
is `(E_(1)r_(2)+E_(2)r_(1))/(r_(1)+r_(2))` and `r=(r_(1)r_(2))/(r_(1)+r_(2))`
soE=2V,`r=1Omega`
`1=(2V)/(2+1)=(2)/(3)` amp.