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Magnetism and Electromagnetism

Magnetism and Electromagnetism
If the steel disk in a crankshaft position sensor has stopped with the tab in the magnet's air gap, the induced voltage

Decrease
Is zero
None of the listed here
Increase

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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?

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

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Magnetism and Electromagnetism
What is the reluctance of a material that has a length of 0.07 m, a cross-sectional area of 0.014 m2, and a permeability of 4,500 Wb/At × m?

11 At/Wb
1 At/Wb
111 At/Wb
1111 At/Wb

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

Ferromagnetic
Diamagnetic
None of the listed here
Paramagnetic

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

30 AT
300 AT
0.3 AT
3 AT

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Magnetism and Electromagnetism
Fleming's left hand rule is used to find

Direction of flux in a solenoid
Direction of force on a current carrying conductor in a magnetic field
Direction of magnetic field due to current carrying conductor
Polarity of a magnetic pole

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