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Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityElectrical instrumentMedium2 minPYQ_2021

PhysicsMediumsingle choice

A galvanometer of resistance $50Ω$ is converted to an ammeter. After shunting, the effective resistance of ammeter is $2.5Ω$ . The value of shunt is

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Solution:

The resistance of the galvanometer and the shunt are in parallel. Their equivalent resistance is given by $\frac{1}{R} = \frac{1}{G} + \frac{1}{S} ∴ \frac{1}{S} = \frac{1}{2.5} - \frac{1}{50} = \frac{19}{50}$ Or $S = \frac{50}{19} Ω$

Stream:MHT_CETSubject:PhysicsTopic:Current ElectricitySubtopic:Electrical instrument

⏱ 2mℹ️ Source: PYQ_2021

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