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Magnetism and Electromagnetism

Magnetism and Electromagnetism
What is the magneto-motive force (mmf) of a wire with 8 turns carrying three amperes of current?

240 At
2.4 At
2,400 At
24 At

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Magnetism and Electromagnetism
A conductor of length L has current I passing through it, when it is placed parallel to a magnetic field. The force experienced by the conductor will be

BLI2
None of the listed here
Zero
BLI

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Magnetism and Electromagnetism
Indicate which of the following material does not retain magnetism permanently.

Hardened steel
None of the listed here
Soft iron
Stainless steel

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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

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

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Magnetism and Electromagnetism
A magnetic field exists around

Iron
Moving Charges
Copper
Aluminium

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Magnetism and Electromagnetism
The main constituent of permalloy is

Chromium
Tungsten
Cobalt
Nickel

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