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Magnetism and Electromagnetism

Magnetism and Electromagnetism
Substances which have permeability less than the permeability of free space are known as

Ferro magnetic material
Diamagnetic material
Paramagnetic material
Bipolar

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Magnetism and Electromagnetism
Paramagnetic materials have relative permeability

slightly more than unity
slightly less than unity
equal to that ferromagnetic mate rials
equal to unity

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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?

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

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Magnetism and Electromagnetism
Materials subjected to rapid reversal of magnetism should have

Large area of B-H loop
High co-ercivity and high retentivity
High permeability and low hysteresis loss
High co-ercivity and low density

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Magnetism and Electromagnetism
Temporary magnets are used in

Generators
All of the listed here
Loud speakers
Motors

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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 magnetic field due to current carrying conductor
Direction of force on a current carrying conductor in a magnetic field

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