magnetism and electromagnetism MCQs – Page 4

Practise focused magnetism and electromagnetism questions with marked answers for exam preparation and subject revision.

magnetism and electromagnetism Mcqs

61. The commonly used material for shielding or screening magnetism is____________?
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A. aluminium

B. copper

C. soft iron

D. brass

62. The magnetism left in the iron after exciting field has been removed is known as____________?
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A. susceptance

B. reluctance

C. permeance

D. residual magnetism

63. 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_____________?
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A. 0.0048 N-m

B. 0.048 N-m

C. 0.48 N-m

D. 8 N-m

64. The left hand rule correlates to______________?
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A. self induction, mutual induction and direction of force on a conductor

B. current, magnetic field and direction of force on a conductor

C. magnetic field, electric field and direction of force on a conductor

D. current, induced e.m.f. and direction of force on a conductor

65. The use of permanent magnets is. not made in_____________?
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A. energy meters

B. loud-speakers

C. transformers

D. magnetoes

66. The uniform magnetic field is______________?
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A. the field in which all lines of magnetic flux are parallel and equidistant

B. the field of a set of parallel conductors

C. none of the above

D. the field of a single conductor

67. The unit of relative permeability is_____________?
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A. it is dimensionless

B. henry/sq. m

C. henry/metre

D. henry

68. Which of the following is expected to have the maximum permeability ?
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A. Ebonite

B. Copper

C. Brass

D. Zinc

69. Which of the following statements is correct ?
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A. The magnetic flux inside the exciting coil is same as on its outside surface

B. The magnetic flux inside an exciting coil is zero

C. The magnetic flux inside an exciting coil is lower than its outside surface

D. The magnetic flux inside the exciting coil is greater than its outside surface

70. Which of the following materials are diamagnetic ?
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A. Silver

B. Copper

C. Iron

D. Silver and copper

71. The force between two long parallel conductors is inversely proportional to_____________?
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A. radius of conductors

B. current in one conductor

C. distance between the conductors

D. product of current in two conductors

72. One maxwell is equal to____________?
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A. 10 webers

B. 10 webers

C. 10 webers

D. 10 webers

73. he retentivity (a property) of material is useful for the construction of_______________?
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A. electromagnets

B. permanent magnets

C. non-magnetic substances

D. transformers

74. The magnetic reluctance of a material______________?
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A. decreases with increasing cross sectional area of material

B. does not vary with increasing cross-sectional area of material

C. any of the above

D. increases with increasing cross-sec-tional area of material

75. 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____________?
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A. 240 N

B. 0.24 N

C. 2.4 N

D. 24 N

76. Which of the following is a ferromagnetic material ?
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A. Tungsten

B. Copper

C. Aluminium

D. Nickel

77. The susceptibility of paramagnetic materials generally lies between____________?
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A. 1CT3 and 1CT7

B. 10?2 and KT5

C. KT4 and KT8

D. KT3 and 1CT6

78. Ferrites are a sub-group of_______________?
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A. ferro-magnetic materials

B. paramagnetic materials

C. ferri-magnetic materials

D. non-magnetic materials

79. The unit of flux is the same as that of_______________?
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A. resistance

B. reluctance

C. pole strength

D. permeance

80. Flemings left hand rule is used to find_________________?
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A. direction of flux in a solenoid

B. direction of magnetic field due to current carrying conductor

C. polarity of a magnetic pole

D. direction of force on a current carrying conductor in a magnetic field

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