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Magnetism and Electromagnetism

Magnetism and Electromagnetism
Two long parallel conductors carry 100 A. If the conductors are separated by 20 mm, the force per meter of length of each conductor will be

0.01 N
100 N
0.1 N
10 N

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Magnetism and Electromagnetism
Which of the following is a ferromagnetic material?

Aluminium
Tungsten
Copper
Nickel

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Magnetism and Electromagnetism
Strength of an electromagnet can be increased by

Increasing the number of turns
All of the listed here
Increasing current supply
Increasing the cross-sectional area

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Magnetism and Electromagnetism
When the current through the coil of an electromagnet reverses, the

magnetic field collapses
direction of the magnetic field remains unchanged
direction of the magnetic field reverses
magnetic field expands

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Magnetism and Electromagnetism
The magnetic materials exhibit the property of magnetisation because of

spin of nucleus
either of these
orbital motion of electrons
spin of electrons

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

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