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Magnetism and Electromagnetism

Magnetism and Electromagnetism
Gilbert is a unit of

conductance
magnetomotive force
electromotive force
permittivity

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Magnetism and Electromagnetism
How does the magnetic compass needle behave in a magnetic field?

None of the listed here
It assures a position which follows a line of magnetic flux
It assures a position right angle to magnetic field
It starts rotating

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Magnetism and Electromagnetism
Ferrites are materials.

Ferromagnetic
None of the listed here
Diamagnetic
Paramagnetic

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Magnetism and Electromagnetism
There is 900 mA of current through a wire with 40 turns. What is the reluctance of the circuit if the flux is 400 Wb?

90,000 At/Wb
9,000 At/Wb
1,440 At/Wb
14,400 At/Wb

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Magnetism and Electromagnetism
Materials subjected to rapid reversal of magnetism should have

High permeability and low hysteresis loss
Large area of B-H loop
High co-ercivity and high retentivity
High co-ercivity and low density

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Magnetism and Electromagnetism
What is the magneto-motive force in a 75-turn coil of wire when there are 4 A of current through it?

3 AT
300 AT
0.3 AT
30 AT

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MORE MCQ ON Magnetism and Electromagnetism

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