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  4. In the circuit shown in figure, the galvanometer G shows zero deflection. If the batteries A and B have negligible internal resistance, the value of the resistor R will be

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Q. In the circuit shown in figure, the galvanometer $G$ shows zero deflection. If the batteries $A$ and $B$ have negligible internal resistance, the value of the resistor $R$ will bePhysics Question Image

Solution:

$I \times 500=12-2=10\, V$
$I =20\, mA$
$IR =2 \Rightarrow R =\frac{2}{20 \times 10^{-3}}$
$=100\, \Omega$