<h1 class=”banner-heading”>Magnetism and Electromagnetism Mcqs</h1>
This set of Electrical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “Magnetism and Electromagnetism”. These questions are chosen from a collection of most authoritative and best reference books on Electrical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our Mcqs to assimilate Magnetism and Electromagnetism comprehensively.

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31.
When a magnet is in motion relative to a coil the induced e.m.f. does not depend upon____________?

Resistance of the coil

Motion of the magnet

Number of turns of the coil

Pole strength of the magnet

32.
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 be zero

Will be infinite

Will depend on the amount of e.m.f. applied

Will depend on the radius of the circle

33.
A 300 mm long conductor is carrying a current of 10 A and is situated at right angles to a magnetic field having a flux density of 0.8 T ; the force on the conductor will be____________?

240 N

24 N

2.4 N

0.24 N

34.
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 ?

2500 AT/m

250 AT/m

25 AT/m

2.5 AT/m

35.
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_____________?

100 N

10 N

1 N

0.1 N

36.
A 200 turn coil having an axial length of 30 mm and a radius of 10 mm is pivoted in a magnetic field having a flux density of 0.8 T. If the coil carries a current of 0.5 A, the torque acting on the coil will be_____________?

8 N-m

0.48 N-m

0.048 N-m

0.0048 N-m

37.
A square cross-sectional magnet has a pole strength of 1 x 10 Wb and cross sectional area of 20 mm x 20 mm. What is the strength at a distance of 100 mm from the unit pole in air ?

63.38 N/Wb

633.8 N/Wb

6338 N/Wb

63380 N/Wb

39.
What is the magnitude and the direction of force per 1.1m length of a pair of conductors of a direct current linecarrying 10 amperes and spaced 100 mm apart ?

22 x 10″8 N

22 x 10″7 N

22 x 10-6 N

22 x 10″5 N

40.
The unit of flux is the same as that of_______________?

Reluctance

Resistance

Permeance

Pole strength

41.
The commonly used material for shielding or screening magnetism is____________?

Copper

Aluminium

Soft iron

Brass

42.
The Biot-savart’s law is a general modification of_______________?

Kirchhoffs law

Lenz’s law

Ampere’s law

Faraday’s laws

43.
If a copper disc is rotated rapidly below a freely suspended magnetic needle, the magnetic needle shall start rotating with a velocity?

Less than that of disc but in opposite direction

Equal to that of disc and in the same direction

Equal to that of disc and in the opposite direction

Less than that of disc and in the same direction

44.
What will be the current passing through the ring shaped air cored coil when number of turns is 800 and ampere turns are 3200 ?

2

4

6

8

45.
The materials are a bit inferior conductors of magnetic flux than air

Ferromagnetic

Paramagnetic

Diamagnetic

Dielectric

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