Physics - Current Electricity Question with Solution | TestHub

For the circuit shown, with $R_1=1.0\Omega$ , $R_2=2.0\Omega$ , $E_1=2\mathrm{V}$ and $E_2=E_3=4\mathrm{V},$ the potential difference between the points $‘a’$ and $‘b’$ is approximately ( $in\mathrm{V}$ ):