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Magnetism and Electromagnetism

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

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

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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
240 N
24 N
2.4 N

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Magnetism and Electromagnetism
Degaussing is the process of

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

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

0.24 AT
2.4 AT
24 AT
240 AT

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Magnetism and Electromagnetism
The most effective and quickest may of making a magnet from soft iron is by

Rubbing with another magnet
Placing it inside a coil carrying current
Induction
The use of permanent magnet

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Magnetism and Electromagnetism
Hysteresis loop in case of magnetically hard materials is more in shape as compared to magnetically soft materials.

None of the listed here
circular
triangular
rectangular

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MORE MCQ ON Magnetism and Electromagnetism

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