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Magnetism and Electromagnetism

Magnetism and Electromagnetism
What is the flux density in a magnetic field in which the flux in 0.1 m2 is 600 Wb?

600 T
6 T
600 T
6,000 T

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

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Magnetism and Electromagnetism
Which of the following is a vector quantity?

Magnetic field intensity
Relalative permeability
Magnetic potential
Flux density

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Magnetism and Electromagnetism
Paramagnetic materials have relative permeability

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

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Magnetism and Electromagnetism
The most effective and quickest may of making a magnet from soft iron is by

Rubbing with another magnet
Induction
The use of permanent magnet
Placing it inside a coil carrying current

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Magnetism and Electromagnetism
A rectangular magnet of magnetic moment M is cut into two piece of same length, the magnetic moment of each piece will be

2M
M/2
M
M/4

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