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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?

2.4 At
240 At
2,400 At
24 At

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Magnetism and Electromagnetism
The force between two long parallel conductors is inversely proportional to

Distance between the conductors
Current in one conductor
Product of current in two conductors
Radius of conductor

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Magnetism and Electromagnetism
Fleming's left hand rule is used to find

Direction of flux in a solenoid
Direction of magnetic field due to current carrying conductor
Polarity of a magnetic pole
Direction of force on a current carrying conductor in a magnetic field

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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

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

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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

BLI
Zero
BLI2
None of the listed here

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

Soft iron
None of the listed here
Stainless steel
Hardened steel

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