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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?

300 At
187 At
18.75 At
30 At

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Magnetism and Electromagnetism
The initial permeability of an iron rod is

The permeability at the end of the iron rod
The lowest permeability of the iron rod
The highest permeability of the iron rod
The permeability almost in non-magnetised state

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

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Magnetism and Electromagnetism
The attraction capacity of electromagnet will increase if the

Flux density decreases
Flux density increases
Core area increases
Core length increases

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Magnetism and Electromagnetism
The bar magnet has

None of the listed here
Both dipole and monopole moment
Monopole moment
Dipole moment

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Magnetism and Electromagnetism
The two conductors of a transmission line carry equal current I in opposite directions. The force on each conductor is

proportional to X
inversely proportional to I
proportional to 7
proportional to distance between the conductors

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