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Magnetism and Electromagnetism

Magnetism and Electromagnetism
The materials having low retentivity are suitable for making

Permanent magnet
Weak magnet
None of the listed here
Temporary Magnet

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Magnetism and Electromagnetism
What is the magneto-motive force in a 75-turn coil of wire when there are 4 A of current through it?

150 At
300 At
200 At
100 At

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Magnetism and Electromagnetism
Which of the following is not a unit of flux?

All of the listed here
Tesla
Maxwell
Weber

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

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Magnetism and Electromagnetism
The induced voltage across a stationary conductor in a stationary magnetic field is

reversed in polarity
zero
increased
decreased

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

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MORE MCQ ON Magnetism and Electromagnetism

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