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Magnetism and Electromagnetism

Magnetism and Electromagnetism
An electromagnetic field exists only when there is

current
decreasing current
an increasing current
voltage

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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
2500 AT/m
250 AT/m

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Magnetism and Electromagnetism
A permeable substance is one

which is a good conductor
through which the magnetic lines of force can pass very easily
which is a strong magnet
which is a bad conductor

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

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

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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?

4
6
8
12

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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?

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

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MORE MCQ ON Magnetism and Electromagnetism

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