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 × 10-5 T and electrical resistance of the coil is 12.56 Ω, then the maximum induced current in the coil will be:
- 0.25 A
- 1.5 A
- 1 A
- 2 A
The Correct Option is C
Solution and Explanation
Emax = NWAB
Emax = \(1000 \times 2 \times \pi \times (10)^2 \times 2 \times (10)^{-5}\)
Emax = \(12.56\) V
Imax = \(\frac{E_{max}}{R}\)
Imax = \(\frac{12.56}{12.56}\)
Imax = \(1\) A
So, the correct option is (C): 1 A
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Magnets are used in many devices like electric bells, telephones, radio, loudspeakers, motors, fans, screwdrivers, lifting heavy iron loads, super-fast trains, especially in foreign countries, refrigerators, etc.
Magnetite is the world’s first magnet. This is also called a natural magnet. Though magnets occur naturally, we can also impart magnetic properties to a substance. It would be an artificial magnet in that case.
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Some of the properties of the magnetic field lines are:
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