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Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityElectrical instrumentEasy2 minPYQ_2020

PhysicsEasysingle choice

The potentiometer wire is of length $1200 cm$ and it carries a current of $60 mA$ . For a cell of emf $5 V$ and internal resistance of $20 Ω$ , the null point on it is found to be at $1000 cm$ . The resistance of potentiometer wire is

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Solution:

Potential gradient $= \frac{5}{1000} = \frac{V_{p}}{1200} R_{P} = \frac{V_{P}}{I} = \frac{6}{60 \times 10^{- 3}} = 100 Ω$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Current ElectricitySubtopic:Electrical instrument

⏱ 2mℹ️ Source: PYQ_2020

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