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Electromagnetic Induction
Motional EMF – Rotating Coil
1 question from 1 paper, each with its answer.
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- of Electromagnetic Induction
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Concepts tested
- maximum induced current in a rotating coil
All Questions
2022 1 question
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A big circular coil of 100 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 $2\times10^{-5}\ T$ and electrical resistance of the coil is $12.56\ \Omega$, then the maximum induced current in the coil will be :$i_{max} = \frac{E_{max}}{R} = \frac{NBA\omega}{R}$ $i_{max} = \frac{1000 \times 2 \times 10^{-5} \times \pi(10)^2 \times 2}{12.56}$ $i_{max} = 1$ A (The original question has 1000 turns; with 100 turns the current would be 0.1 A.)