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Magnetism and Electromagnetism

Magnetism and Electromagnetism
The bar magnet has

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

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Magnetism and Electromagnetism
What is the reluctance of a material that has a length of 0.07 m, a cross-sectional area of 0.014 m2, and a permeability of 4,500 Wb/At × m?

1 At/Wb
11 At/Wb
111 At/Wb
1111 At/Wb

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Magnetism and Electromagnetism
Which of the following is the unit of magnetic flux density?

None of the listed here
Lumens
Weber
Tesla

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Magnetism and Electromagnetism
An electromagnetic field exists only when there is

voltage
current
decreasing current
an increasing current

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Magnetism and Electromagnetism
What will be the magnetic potential difference across the air gap of 2 cm length in magnetic field of 200 AT/m?

10 AT
4 AT
16 AT
8 AT

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Magnetism and Electromagnetism
For a given wire-wound core, an increase in current through the coil

Reverses the flux lines
Decreases the flux density
Increases the flux density
Causes no change in flux density

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