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Magnetism and Electromagnetism

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
0.01 N
100 N
10 N

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

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

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Magnetism and Electromagnetism
Materials subjected to rapid reversal of magnetism should have

Large area of B-H loop
High co-ercivity and low density
High permeability and low hysteresis loss
High co-ercivity and high retentivity

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Magnetism and Electromagnetism
The susceptibility of paramagnetic materials generally lies between

1CT3 and 1CT7
KT3 and 1CT6
KT4 and KT8
10"2 and KT5

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Magnetism and Electromagnetism
The electromagnet has 50 turns and a current of 1A flows through the coil. If the length of the magnet circuit is 200 mm, what is the magnetic field strength?

0.25 AT/m
25 AT/m
250 AT/m
2500 AT/m

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Magnetism and Electromagnetism
What is the magneto-motive force (mmf) of a wire with 8 turns carrying three amperes of current?

24 At
2,400 At
2.4 At
240 At

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