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Magnetism and Electromagnetism

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

0.24 N
24 N
240 N
2.4 N

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Magnetism and Electromagnetism
Air gap has_______eluctance as compared to iron or steel path

lower
higher
little
zero

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Magnetism and Electromagnetism
Core of an electromagnet should have

Low coercivity
None of the listed here
Both low coercivity and high susceptibility
High susceptibility

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Magnetism and Electromagnetism
Degaussing is the process of

Demagnetising metallic parts
Removal of magnetic impurities
Removing gases from the materials
Remagnetising metallic parts

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Magnetism and Electromagnetism
A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will

Decrease
Increase
Be excessive
Remain Constant

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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
Direction of force on a current carrying conductor in a magnetic field
Polarity of a magnetic pole

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