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Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityElectrical instrumentMedium2 minQB

PhysicsMediumsingle choice

$A B$ is a wire of uniform resistance. With a $70 Ω$ resistor in place of the $80 Ω$ resistor, the galvanometer $G$ shows no deflection when the length $A C = 30$ cm and $CB = 70$ cm. The resistance $R$ is equal to

Options:

Answer:

Solution:

At balance (Wheatstone condition):

$\frac{R}{70} = \frac{A C}{CB} = \frac{30}{70}$

$R = 30 Ω$

Stream:JEESubject:PhysicsTopic:Current ElectricitySubtopic:Electrical instrument

⏱ 2mℹ️ Source: QB

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