What should be the resistance $R$ shown in figure so that galvanometer shows zero deflection?

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Solution

$\frac{P}{Q} = \frac{20}{20} = \frac{1}{1}$
$\frac{R}{S} = \frac{10}{10} = \frac{1}{1}$
This circuit represents Wheatstone bridge.
$∴$ Resistance in arm $A S$ will not work.
$∴$ Current flowing through $R = 0$
Hence, for the any value of resistance $R$ , the current flowing by the ammeter will be zero.

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What should be the resistance R shown in figure so that galvanometer shows zero deflection?

PQ=2020=11RS=1010=11This circuit represents Wheatstone bridge.∴ Resistance in arm AS will not work.∴ Current flowing through R=0Hence, for the any value of resistance R, the current flowing by the ammeter will be zero.

What should be the resistance $R$ shown in figure so that galvanometer shows zero deflection?