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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
9,000 At/Wb
1,440 At/Wb

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Magnetism and Electromagnetism
Temporary magnets are used in

Loud speakers
All of the listed here
Generators
Motors

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Magnetism and Electromagnetism
The materials are a bit inferior conductors of magnetic flux than air.

None of the listed here
Diamagnetic
Ferromagnetic
Dielectric

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Magnetism and Electromagnetism
A magnetic field exists around

Aluminium
Copper
Moving Charges
Iron

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Magnetism and Electromagnetism
A permeable substance is one

Which is a bad conductor
Which is a good conductor
Through which the magnetic lines of force can pass very easily
Which is a strong magnet

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Magnetism and Electromagnetism
The relative permeability of materials is not constant.

None of the listed here
Diamagnetic
Ferromagnetic
Paramagnetic

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