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Magnetism and Electromagnetism

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

187 At
30 At
300 At
18.75 At

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Magnetism and Electromagnetism
Reciprocal of permeability is

Permeability
conductance
Susceptibility
Reluctivity

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

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Magnetism and Electromagnetism
If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density

remains the same
doubles
increases
decreases

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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?

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

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Magnetism and Electromagnetism
Unit for quantity of electricity is

Joule
Coulomb
Ampere-hour
Ampere

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MORE MCQ ON Magnetism and Electromagnetism

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