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Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityElectrical instrumentEasy2 minPYQ_2020

PhysicsEasysingle choice

The resistance of a moving coil galvanometer is $20 Ω$ . It requires $0 .01 A$ current for full-scale deflection. The value of resistance to convert it into a voltmeter of the range $20 V$ will be

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Answer:

Solution:

$V_{G} = I_{G} G$

$V_{G} = 0.01 \times 20 = 0.2 V$

$R = (\frac{V}{V_{G}} - 1) G$

$R = (\frac{20}{0.2} - 1) (20) = 1980 Ω$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Current ElectricitySubtopic:Electrical instrument

⏱ 2mℹ️ Source: PYQ_2020

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