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Magnetism and Electromagnetism

Magnetism and Electromagnetism
What is the magneto-motive force (mmf) of a wire with 8 turns carrying three amperes of current?

2,400 At
240 At
2.4 At
24 At

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Magnetism and Electromagnetism
Which of the following materials are diamagnetic?

Silver and copper
Silver
Copper
Iron

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

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Magnetism and Electromagnetism
The stray line of magnetic flux is defined as

A line of magnetic flux in a non-uniform field
A line of magnetic flux which does not follow the designed path
The mean length of a ring shaped coil
A line vertical to the flux lines

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Magnetism and Electromagnetism
For which of the following materials the saturation value is the highest?

Diamagnetic materials
Ferrites
Ferromagnetic materials
Paramagnetic materials

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Magnetism and Electromagnetism
Core of an electromagnet should have

Both low coercivity and high susceptibility
High susceptibility
None of the listed here
Low coercivity

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