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Magnetism and Electromagnetism

Magnetism and Electromagnetism
There is 900 mA of current through a wire with 40 turns. What is the reluctance of the circuit if the flux is 400 Wb?

9,000 At/Wb
1,440 At/Wb
14,400 At/Wb
90,000 At/Wb

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Magnetism and Electromagnetism
Which of the following is not a unit of flux?

Maxwell
All of the listed here
Weber
Tesla

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Magnetism and Electromagnetism
How does the magnetic compass needle behave in a magnetic field?

None of the listed here
It assures a position which follows a line of magnetic flux
It starts rotating
It assures a position right angle to magnetic field

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

Ferromagnetic material
Paramagnetic material
Ferrits
Diamagnetic material

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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 bad conductor
Which is a good conductor

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Magnetism and Electromagnetism
The unit of flux is the same as that of

Resistance
Permanance
Pole strength
Reluctance

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