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Magnetism and Electromagnetism

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?

4
12
8
6

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

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

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Magnetism and Electromagnetism
Ferrites are materials.

Diamagnetic
Ferromagnetic
Paramagnetic
None of the listed here

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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?

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

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

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Magnetism and Electromagnetism
A magnetic field exists around

Copper
Iron
Moving Charges
Aluminium

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