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Physics - EMI/AC Question with Solution | TestHub

PhysicsEMI/ACFaraday law/Lenz lawHard2 minPYQ_2022

PhysicsHardsingle choice

A big circular coil of $1000$ turns and average radius $10 m$ is rotating about its horizontal diameter at $2 rad s^{- 1}$ . If the vertical component of earth's magnetic field at that place is $2 \times 10^{- 5} T$ and electrical resistance of the coil is $12.56 Ω$ , then the maximum induced current in the coil will be:NEET 2022 (Phase 1)

Options:

Answer:

Solution:

The magnetic flux is given by,

$ϕ = B A \cos ω t$ . Therefore, induced EMF,

$ε = - \frac{d ϕ}{d t} = - B A ω \sin ω t$

For maximum current $\sin ω t = 1$

$\Rightarrow i_{m a x} = \frac{B A ω}{R} = \frac{B N π r^{2} ω}{R} = \frac{2 \times 10^{- 5} \times 1000 \times 3.14 \times 100 \times 2}{12.56} = 1 A$

Stream:NEETSubject:PhysicsTopic:EMI/ACSubtopic:Faraday law/Lenz law

⏱ 2mℹ️ Source: PYQ_2022

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