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Magnetism and Electromagnetism

Magnetism and Electromagnetism
One telsa is equal to

1 Wb/mm²
1 mWb/m²
1 Wb/m²
1 Wb/m

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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?

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

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

Weber
All of the listed here
Tesla
Maxwell

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Magnetism and Electromagnetism
A basic one-loop dc generator is rotated at 90 rev/s. How many times each second does the dc output voltage peak (reach maximum)?

180
270
90
360

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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

M
M/4
M/2
2M

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Magnetism and Electromagnetism
If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density

decreases
doubles
remains the same
increases

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