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Magnetism and Electromagnetism

Magnetism and Electromagnetism
There is 900 mA of current through a wire with 40 turns. What is the reluctance of the circuit if the flux is 400 Wb?

90,000 At/Wb
14,400 At/Wb
1,440 At/Wb
9,000 At/Wb

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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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Magnetism and Electromagnetism
The bar magnet has

Dipole moment
Monopole moment
None of the listed here
Both dipole and monopole moment

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Magnetism and Electromagnetism
The ability of a material to remain magnetized after removal of the magnetizing force is known as

reluctance
retentivity
hysteresis
permeability

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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

remains the same
decreases
increases
doubles

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Magnetism and Electromagnetism
The use of permanent magnets is. not made in

Energy meters
Transformers
None of the listed here
Loud speakers

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