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Magnetism and Electromagnetism

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

187 At
30 At
18.75 At
300 At

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

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

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Magnetism and Electromagnetism
Strength of an electromagnet can be increased by

Increasing current supply
Increasing the cross-sectional area
All of the listed here
Increasing the number of turns

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

Ferromagnetic materials
Paramagnetic materials
Ferrites
Diamagnetic materials

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Magnetism and Electromagnetism
The ratio of intensity of magnetisation to the magnetisation force is known as

Susceptibility
Relatice permeability
Flux density
None of the listed here

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Magnetism and Electromagnetism
The direction of magnetic lines of force is

From south pole to north pole
None of the listed here
From north pole to south pole
From one end of the magnet to another

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