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Magnetism and Electromagnetism

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

decreases
remains constant
reaches zero
increases

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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
Motion of the magnet
Resistance of the coil

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Magnetism and Electromagnetism
How does the magnetic compass needle behave in a magnetic field?

None of the listed here
It starts rotating
It assures a position right angle to magnetic field
It assures a position which follows a line of magnetic flux

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Magnetism and Electromagnetism
Materials subjected to rapid reversal of magnetism should have

Large area of B-H loop
High permeability and low hysteresis loss
High co-ercivity and low density
High co-ercivity and high retentivity

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Magnetism and Electromagnetism
A permeable substance is one

through which the magnetic lines of force can pass very easily
which is a good conductor
which is a bad conductor
which is a strong magnet

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Magnetism and Electromagnetism
When two ends of a circular uniform wire are joined to the terminals of a battery, the field at the center of the circle

will be infinite
will depend on the amount of e.m.f. applied
will be zero
will depend on the radius of the circle

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MORE MCQ ON Magnetism and Electromagnetism

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