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Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityElectrical instrumentMedium2 minPYQ_2015

PhysicsMediumsingle choice

A potentiometer wire of length $L$ and a resistance $r$ are connected in series with a battery of e.m.f. $E_{0}$ and a resistance $r_{1}$ . An unknown e.m.f. $E$ is balanced at a length $l$ of the potentiometer wire. The e.m.f. $E$ will be given by:NEET 2015 (Phase 2)

Options:

Answer:

Solution:

$K =$ potential gradient $= (\frac{E_{0} r}{r + r_{1}}) \frac{1}{L}$

So $E = K l = \frac{E_{0} r l}{(r + r_{1}) L}$

Stream:NEETSubject:PhysicsTopic:Current ElectricitySubtopic:Electrical instrument

⏱ 2mℹ️ Source: PYQ_2015

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