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Magnetism and Electromagnetism

Magnetism and Electromagnetism
The unit of flux is the same as that of

Permanance
Resistance
Reluctance
Pole strength

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Magnetism and Electromagnetism
If a loop in a basic dc generator suddenly begins rotating at a faster speed, the induced voltage

increases
decreases
reverses polarity
remains unchanged

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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?

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

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Magnetism and Electromagnetism
What is the mmf of a wire with 8 turns carrying three amperes of current?

0.24 AT
2.4 AT
240 AT
24 AT

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Magnetism and Electromagnetism
The most effective and quickest may of making a magnet from soft iron is by

The use of permanent magnet
Induction
Placing it inside a coil carrying current
Rubbing with another magnet

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Magnetism and Electromagnetism
Paramagnetic materials have relative permeability

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

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MORE MCQ ON Magnetism and Electromagnetism

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