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MCQs 1: 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
Answer Explanation

MCQs 2: 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
Answer Explanation

MCQs 3: 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
Answer Explanation

MCQs 4: 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
Answer Explanation

MCQs 5: 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
Answer Explanation

MCQs 6: 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
Answer Explanation

MCQs 7: Unit for quantity of electricity is_____________?

ampere-hour watt joule coulomb
Answer Explanation

MCQs 8: 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
Answer Explanation

MCQs 9: The unit of flux is the same as that of_______________?

reluctance resistance permeance pole strength
Answer Explanation

MCQs 10: The commonly used material for shielding or screening magnetism is____________?

copper aluminium soft iron brass
Answer Explanation

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