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Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityElectrical instrumentEasy2 minPYQ_2020

PhysicsEasysingle choice

In a potentiometer experiment if the voltage across resistance $R$ and $R + r$ are balanced at the length $l_{1}$ and $l_{2}$ respectively the value of resistance $r$ will be

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Answer:

Solution:

$V_{R} = k l_{1}$

$V_{(R + r)} = k l_{2}$

$\frac{R + r}{R} = \frac{l_{2}}{l_{1}}$

$1 + \frac{r}{R} = \frac{l_{2}}{l_{1}}$

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

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

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

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Current ElectricitySubtopic:Electrical instrument

⏱ 2mℹ️ Source: PYQ_2020

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