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MCQs

Total Questions : 575 | Page 6 of 58 pages
Question 51. 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
  1.    100 N
  2.    10 N
  3.    1 N
  4.    0.1 N
 Discuss Question
Answer: Option D. -> 0.1 N
Question 52. When a magnet is in motion relative to a coil the induced e.m.f. does not depend upon
  1.    Resistance of the coil
  2.    Motion of the magnet
  3.    Number of turns of the coil
  4.    Pole strength of the magnet
 Discuss Question
Answer: Option A. -> Resistance of the coil
Question 53. Substances which have permeability less than the permeability of free space are known as
  1.    Ferromagnetic
  2.    Paramagnetic
  3.    Diamagnetic
  4.    Bipolar
 Discuss Question
Answer: Option C. -> Diamagnetic
Question 54. 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 ?
  1.    63.38 N/Wb
  2.    633.8 N/Wb
  3.    6338 N/Wb
  4.    63380 N/Wb
 Discuss Question
Answer: Option C. -> 6338 N/Wb
Question 55. Paramagnetic materials have relative permeability
  1.    slightly less than unity
  2.    equal to unity
  3.    slightly more than unity
  4.    equal to that ferromagnetic mate rials
 Discuss Question
Answer: Option C. -> slightly more than unity
Question 56. For which of the following materials the net magnetic moment should be zero?
  1.    Diamagnetic materials
  2.    Ferrimagnetic materials
  3.    Antiferromagnetic materials
  4.    Antiferrimagnetic materials
 Discuss Question
Answer: Option C. -> Antiferromagnetic materials
Question 57. In a simple magnetic field the strength of magnet flux
  1.    is constant and has same value in energy part of the magnetic field
  2.    increases continuously from initial value to final value
  3.    decreases continuously from initial value to final value
  4.    first increases and then decreases till it becomes zero
 Discuss Question
Answer: Option D. -> first increases and then decreases till it becomes zero
Question 58. For a given wire-wound core, an increase in current through the coil
  1.    Reverses the flux lines
  2.    Decreases the flux density
  3.    Increases the flux density
  4.    Causes no change in flux density
 Discuss Question
Answer: Option C. -> Increases the flux density
Question 59. In the left hand rule, forefinger always represents
  1.    voltage
  2.    current
  3.    magnetic field
  4.    direction of force on the conductor
 Discuss Question
Answer: Option C. -> magnetic field
Question 60. The Biotsavart's law is a general modification of
  1.    Kirchhoff's law
  2.    Lenz's law
  3.    Ampere's law
  4.    Faraday's laws
 Discuss Question
Answer: Option C. -> Ampere's law

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