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Magnetism and Electromagnetism

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)?

360
90
180
270

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

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Magnetism and Electromagnetism
When a solenoid is activated, the force that moves the plunger is

varying voltage
a steady current
an electromagnetic field
a permanent magnetic field

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Magnetism and Electromagnetism
What is the mmf of a wire with 8 turns carrying three amperes of current?

24 AT
240 AT
0.24 AT
2.4 AT

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Magnetism and Electromagnetism
The relative permeability of materials is not constant.

None of the listed here
Ferromagnetic
Diamagnetic
Paramagnetic

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Magnetism and Electromagnetism
The induced voltage across a stationary conductor in a stationary magnetic field is

zero
decreased
increased
reversed in polarity

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MORE MCQ ON Magnetism and Electromagnetism

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