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MAGNETISM AND ELECTROMAGNETISM

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

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

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Magnetism and Electromagnetism
Hysteresis loop in case of magnetically hard materials is more in shape as compared to magnetically soft materials.

rectangular
triangular
None of the listed here
circular

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Magnetism and Electromagnetism
A permeable substance is one

which is a strong magnet
through which the magnetic lines of force can pass very easily
which is a good conductor
which is a bad conductor

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

A line vertical to the flux lines
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

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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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