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Magnetism and Electromagnetism

Magnetism and Electromagnetism
What is the flux density when the flux is 5.5 Wb and the cross-sectional area is 6 × 10–3 m2?

91.7 T
917 T
9.7 T
91 T

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Magnetism and Electromagnetism
If a loop in a basic dc generator suddenly begins rotating at a faster speed, the induced voltage

decreases
reverses polarity
remains unchanged
increases

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Magnetism and Electromagnetism
The stray line of magnetic flux is defined as

A line vertical to the flux lines
A line of magnetic flux in a non-uniform field
The mean length of a ring shaped coil
A line of magnetic flux which does not follow the designed path

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Magnetism and Electromagnetism
Ferrites are materials.

Paramagnetic
Ferromagnetic
Diamagnetic
None of the listed here

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Magnetism and Electromagnetism
Air gap has_______eluctance as compared to iron or steel path

zero
lower
little
higher

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

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