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

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Magnetism and Electromagnetism
Magnetism of a magnet can be destroyed by

All of the listed here
Hammering
By inductive action of another magnet
Heating

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Magnetism and Electromagnetism
A keeper is used to

Provide a closed path for flux
Amplify flux
Change the direction of magnetic lines
Restore lost flux

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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
4
6
12

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Magnetism and Electromagnetism
The most effective and quickest may of making a magnet from soft iron is by

Induction
Rubbing with another magnet
The use of permanent magnet
Placing it inside a coil carrying current

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Magnetism and Electromagnetism
The ratio of intensity of magnetisation to the magnetisation force is known as

Flux density
None of the listed here
Susceptibility
Relatice permeability

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