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Physics - EMI/AC Question with Solution | TestHub

PhysicsEMI/ACL-R circuitEasy2 minPYQ_2020

PhysicsEasysingle choice

A coil of inductance $5 H$ is joined to a cell of emf $6 V$ through a resistance of $10 Ω$ at $t = 0$ . The emf across the coil at time $t = l n (\sqrt{2})$ sec is

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Answer:

Solution:

$i = \frac{ε}{R} (1 - e^{- \frac{t R}{L}})$
$∴$ Emf acrossRis $ε_{R} = ε (1 - e^{- \frac{t R}{L}})$
$\Rightarrow ε_{R} = 6 V (1 - e^{- l n \sqrt{2} . 2})$
$\Rightarrow ε_{R} = 6 V (1 - \frac{1}{2}) = 3 V$
$∴$ Voltage across coil $ε_{c} = ε - ε_{R} = 3$ volt

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:EMI/ACSubtopic:L-R circuit

⏱ 2mℹ️ Source: PYQ_2020

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