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Magnetism and Electromagnetism

Magnetism and Electromagnetism
Which of the following is the unit of magnetic flux density?

Lumens
Tesla
None of the listed here
Weber

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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?

300 AT
3 AT
30 AT
0.3 AT

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Magnetism and Electromagnetism
The materials are a bit inferior conductors of magnetic flux than air.

Diamagnetic
Ferromagnetic
None of the listed here
Dielectric

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Magnetism and Electromagnetism
The voltage induced across a certain coil is 200 mV. A 120 resistor is connected to the coil terminals. The induced current is

120 mA
1.7 mA
12 mA
16 mA

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

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

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Magnetism and Electromagnetism
The attraction capacity of electromagnet will increase if the

Core length increases
Flux density decreases
Flux density increases
Core area increases

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