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Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityElectrical instrumentHard2 minPYQ_2022

PhysicsHardsingle choice

A galvanometer of resistance $G$ can be converted into a voltmeter of range $V$ by connecting a resistance $R$ in series with it. The series resistance required to change its range to $\frac{V}{3}$ is

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Answer:

Solution:

Case-1 $R = \frac{V}{I _{G}} - G \Rightarrow I_{G} = \frac{V}{R + G}$ Case-2: $R^{'} = \frac{( \frac{V}{3} )}{I _{G}} - G = \frac{( \frac{V}{3} )}{( \frac{V}{R + G} )} - G = (\frac{R - 2 G}{3})$

Stream:MHT_CETSubject:PhysicsTopic:Current ElectricitySubtopic:Electrical instrument

⏱ 2mℹ️ Source: PYQ_2022

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