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Magnetism and Electromagnetism

Magnetism and Electromagnetism
What is the flux density in a magnetic field in which the flux in 0.1 m2 is 600 Wb?

600 T
600 T
6 T
6,000 T

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Magnetism and Electromagnetism
When a magnet is in motion relative to a coil the induced e.m.f. does not depend upon

Resistance of the coil
Number of turns of the coil
Motion of the magnet
Pole strength of the magnet

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Magnetism and Electromagnetism
What is the reluctance of a material that has a length of 0.07 m, a cross-sectional area of 0.014 m2, and a permeability of 4,500 Wb/At × m?

1111 At/Wb
1 At/Wb
11 At/Wb
111 At/Wb

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Magnetism and Electromagnetism
Which of the following type of materials are not very important for engineering applications?

Diamagnetic material
Ferro magnetic material
Paramagnetic material
None of the listed here

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Magnetism and Electromagnetism
For a given wire-wound core, an increase in current through the coil

Decreases the flux density
Reverses the flux lines
Causes no change in flux density
Increases the flux density

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Magnetism and Electromagnetism
A 300 mm long conductor is carrying a current of 10 A and is situated at right angles to a magnetic field having a flux density of 0.8 T ; the force on the conductor will be

24 N
240 N
0.24 N
2.4 N

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