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Magnetism and Electromagnetism

Magnetism and Electromagnetism
Indicate which of the following material does not retain magnetism permanently.

Stainless steel
None of the listed here
Soft iron
Hardened steel

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Magnetism and Electromagnetism
Air gap has_______eluctance as compared to iron or steel path

higher
zero
lower
little

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Magnetism and Electromagnetism
A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will

Increases
None of the listed here
Decreases
Remain same

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Magnetism and Electromagnetism
What is the mmf of a wire with 8 turns carrying three amperes of current?

2.4 AT
240 AT
24 AT
0.24 AT

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Magnetism and Electromagnetism
When a magnet is in motion relative to a coil the induced e.m.f. does not depend upon

Number of turns of the coil
Pole strength of the magnet
Resistance of the coil
Motion of the magnet

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Magnetism and Electromagnetism
The most effective and quickest may of making a magnet from soft iron is by

Rubbing with another magnet
The use of permanent magnet
Placing it inside a coil carrying current
Induction

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