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Finding currents and voltages (mixed circuits)

In the circuit shown below, four resistors,

R_{1}

R_{2}

R_{3}

, and

R_{4}

, are connected to a cell of voltage,

V = 4 V

$R_{1}$ ‍	$R_{2}$ ‍	$R_{3}$ ‍	$R_{4}$ ‍
$3 Ω$ ‍	$12 Ω$ ‍	$8 Ω$ ‍	$2 Ω$ ‍

What is the potential difference, $V_{4}$ ‍, across $R_{4}$ ‍?

V_{4} =

V

Class 12 Physics (India)