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Magnetism and Electromagnetism

Magnetism and Electromagnetism
Temporary magnets are used in

Loud speakers
All of the listed here
Generators
Motors

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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

Decreases
None of the listed here
Increases
Remain same

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Magnetism and Electromagnetism
What will be the current passing through the ring shaped air cored coil when number of turns is 800 and ampere turns are 3200?

8
6
12
4

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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

0.1 N
10 N
0.01 N
100 N

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Magnetism and Electromagnetism
For which of the following materials the saturation value is the highest?

Diamagnetic materials
Ferrites
Paramagnetic materials
Ferromagnetic materials

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

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

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MORE MCQ ON Magnetism and Electromagnetism

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