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Magnetism and Electromagnetism

Magnetism and Electromagnetism
The magnetism left in the iron after exciting field has been removed is known as

susceptance
reluctance
permeance
residual magnetism

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Magnetism and Electromagnetism
In the left hand rule, forefinger always represents

direction of force on the conductor
Voltage
current
magnetic field

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Magnetism and Electromagnetism
What is the mmf of a wire with 8 turns carrying three amperes of current?

2.4 AT
24 AT
0.24 AT
240 AT

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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?

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

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Magnetism and Electromagnetism
The induced voltage across a coil with 250 turns that is located in a magnetic field that is changing at a rate of 8 Wb/s is

3,125 V
31.25 V
1,000 V
2,000 V

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Magnetism and Electromagnetism
Which of the following materials are diamagnetic?

Silver and copper
Iron
Copper
Silver

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