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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?

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

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

600 T
6,000 T
6 T
600 T

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Magnetism and Electromagnetism
The unit for permeability is

Wb/At × m
Wb
At/m
At/Wb

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Magnetism and Electromagnetism
What is the magnetomotive force in a 75-turn coil of wire when there are 4 A of current through it?

187 At
300 At
30 At
18.75 At

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