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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?

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

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Magnetism and Electromagnetism
When two ends of a circular uniform wire are joined to the terminals of a battery, the field at the center of the circle

will depend on the amount of e.m.f. applied
will depend on the radius of the circle
will be zero
will be infinite

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Magnetism and Electromagnetism
In the left hand rule, forefinger always represents

magnetic field
direction of force on the conductor
current
Voltage

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Magnetism and Electromagnetism
Tesla is a unit of

Field strength
Inductance
Flux density
Flux

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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 low density
High co-ercivity and high retentivity
High permeability and low hysteresis loss

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Magnetism and Electromagnetism
Paramagnetic materials have relative permeability

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

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