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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?

12
8
6
4

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Magnetism and Electromagnetism
Core of an electromagnet should have

Low coercivity
None of the listed here
High susceptibility
Both low coercivity and high susceptibility

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Magnetism and Electromagnetism
A permeable substance is one

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

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Magnetism and Electromagnetism
The relative permeability of materials is not constant.

None of the listed here
Ferromagnetic
Paramagnetic
Diamagnetic

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Magnetism and Electromagnetism
A permeable substance is one

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

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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?

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

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