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Magnetism and Electromagnetism

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?

300 AT
0.3 AT
3 AT
30 AT

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Magnetism and Electromagnetism
When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage

increases
reaches zero
decreases
remains constant

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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 T
9.7 T
91.7 T
917 T

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Magnetism and Electromagnetism
When two ends of a circular uniform wire are joined to the terminals of a battery, the field at the center of the circle

will depend on the radius of the circle
will depend on the amount of e.m.f. applied
will be infinite
will be zero

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Magnetism and Electromagnetism
The change of cross-sectional area of conductor in magnetic field will affect

reluctance of conductor
None of these
both of the listed here
resistance of conductor

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Magnetism and Electromagnetism
The induced voltage across a coil with 250 turns that is located in a magnetic field that is changing at a rate of 8 Wb/s is

3,125 V
1,000 V
2,000 V
31.25 V

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