Top 80+ Solved Magnetism and Electromagnetism MCQ Questions Answer
Q. Out of the following statements, concerning an electric field, which statement is not true ?
a. The electric intensity is a vector quantity
b. The electric field intensity at a point is numerically equal to the force exerted upon a charge placed at that point
c. An electric field is defined as a point in space at which an electric charge would experienc* a force
d. Unit field intensity in the exertion of a force of one newton on a charge of one coulomb
Q. When a magnet is in motion relative to a coil the induced e.m.f. does not depend upon
a. resistance of the coil
b. motion of the magnet
c. number of turns of the coil
d. pole strength of the magnet
Q. When two ends of a circular uniform wire are joined to the terminals of a battery, thefield at the centre of the circle
a. will be zero
b. will be infinite
c. will depend on the amount of e.m.f. applied
d. will depend on the radius of the circle
Q. Susceptibility is positive for
a. non-magnetic substances
b. diamagnetic substances
c. ferromagnetic substances
d. none of the above
Q. 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 ?
a. 2500 AT/m
b. 250 AT/m
c. 25 AT/m
d. 2.5 AT/m
Q. 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 ?
a. 22 x 10"8 N
b. 22 x 10"7 N
c. 22 x 10-6 N
d. 22 x 10"5 N
Q. 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 ?
a. 63.38 N/Wb
b. 633.8 N/Wb
c. 6338 N/Wb
d. 63380 N/Wb
Q. The unit of flux is the same as that of
a. reluctance
b. resistance
c. permeance
d. pole strength
Q. The Biot-savart's law is a general modification of
a. Kirchhoffs law
b. Lenz's law
c. Ampere's law
d. Faraday's laws
Q. The most effective and quickest may of making a magnet from soft iron is by
a. placing it inside a coil carrying current
b. induction
c. the use of permanent magnet
d. rubbing with another magnet