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Magnetism and Electromagnetism

Magnetism and Electromagnetism
The electromagnet has 50 turns and a current of 1A flows through the coil. If the length of the magnet circuit is 200 mm, what is the magnetic field strength?

25 AT/m
250 AT/m
0.25 AT/m
2500 AT/m

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Magnetism and Electromagnetism
Temporary magnets are used in

Loud speakers
Motors
All of the listed here
Generators

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Magnetism and Electromagnetism
The direction of magnetic lines of force is

From one end of the magnet to another
From south pole to north pole
None of the listed here
From north pole to south pole

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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

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

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Magnetism and Electromagnetism
When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage

increases
reaches zero
decreases
remains constant

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Magnetism and Electromagnetism
The unit of relative permeability is

Hennry
Its dimensionless
Hennry/meter
None of the listed here

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MORE MCQ ON Magnetism and Electromagnetism

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