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Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityElectrical instrumentEasy2 minPYQ_2020

PhysicsEasysingle choice

A daniel cell is balanced at 125 cm length of a potentiometer wire. When the cell is circuited by a resistance of $2 Ω$ , the balance length is obtained at 100 cm. The internal resistance of the Daniel cell is

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Answer:

Solution:

$r = R (\frac{l_{l}}{l_{2}} - 1)$

$= 2 (\frac{125}{100} - 1)$

$= 2 (\frac{5}{4} - 1)$

$= 2 \times \frac{1}{4}$

$= 0.5 Ω$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Current ElectricitySubtopic:Electrical instrument

⏱ 2mℹ️ Source: PYQ_2020

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