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Magnetism and Electromagnetism

Magnetism and Electromagnetism
Magnetism of a magnet can be destroyed by

By inductive action of another magnet
Heating
All of the listed here
Hammering

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

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

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Magnetism and Electromagnetism
If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density

increases
decreases
remains the same
doubles

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Magnetism and Electromagnetism
What will be the current passing through the ring shaped air cored coil when number of turns is 800 and ampere turns are 3200?

6
4
12
8

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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

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

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Magnetism and Electromagnetism
For which of the following materials the saturation value is the highest?

Ferrites
Ferromagnetic materials
Paramagnetic materials
Diamagnetic materials

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MORE MCQ ON Magnetism and Electromagnetism

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