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Magnetism and Electromagnetism

Magnetism and Electromagnetism
What will be the current passing through the ring shaped air cored coil when number of turns is 800 and ampere turns are 3200?

6
12
8
4

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Magnetism and Electromagnetism
Two long parallel conductors carry 100 A. If the conductors are separated by 20 mm, the force per meter of length of each conductor will be

0.1 N
100 N
0.01 N
10 N

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

240 AT
0.24 AT
2.4 AT
24 AT

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Magnetism and Electromagnetism
The unit of flux is the same as that of

Permanance
Reluctance
Pole strength
Resistance

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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
When a solenoid is activated, the force that moves the plunger is

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

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