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Magnetism and Electromagnetism

Magnetism and Electromagnetism
A 300 mm long conductor is carrying a current of 10 A and is situated at right angles to a magnetic field having a flux density of 0.8 T ; the force on the conductor will be

240 N
2.4 N
24 N
0.24 N

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Magnetism and Electromagnetism
The relative permeability is less than unity is case of

Ferrits
Paramagnetic material
Diamagnetic material
Ferromagnetic material

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Magnetism and Electromagnetism
Paramagnetic materials have relative permeability

equal to that ferromagnetic mate rials
slightly less than unity
slightly more than unity
equal to unity

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Magnetism and Electromagnetism
The uniform magnetic field is

The field in which all lines of magnetic flux are parallel and equidistant
None of the listed here
The field of a set of parallel conductors
The field of a single conductor

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

2.4 At
24 At
240 At
2,400 At

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Magnetism and Electromagnetism
Reciprocal of permeability is

Reluctivity
Susceptibility
Permeability
conductance

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