Tricky Magnetism and Electromagnetism Multiple choice Questions and Answers pdf

82. How does the magnetic compass needle behave in a magnetic field ?
(a)     It assures a position right angle to magnetic field
(b)     It starts rotating
(c) It assures a position which follows a line of magnetic flux
(d) None of the above
Ans: c

83. In a simple magnetic field the strength of magnet flux
(a)     is constant and has same value in energy part of the magnetic field
(6)     increases continuously from initial value to final value
(c) decreases continuously from initial value to final value
(d) first increases and then decreases till it becomes zero
Ans: d

8 4.The stray line of magnetic flux is defined as
(a) a line vertical to the flux lines
(b) the mean length of a ring shaped coil
(c) a line of magnetic flux in a non-uniform field
(d) a line of magnetic flux which does not follow the designed path
Ans: d

85. The bar magnet has
(a)     the dipole moment
(b)     monopole moment
(c) (a) and (b) both
(d) none of the above
Ans: a

86. Which of the following materials are dia-magnetic ?
(a)     Silver
(b)     Copper
(c) Silver and copper
(d) Iron
Ans: c

87. Which of the following type of materials are not very important for engineering applications ?
(a)     Ferromagnetic
(b)     Paramagnetic
(c) Diamagnetic
(d) None of the above
 Ans: c

88. The susceptibility of paramagnetic materials generally lies between
(a) KT3 and 1CT6
(b) 1CT3 and 1CT7
(c) KT4 and KT8
(d) 10"2 and KT5
Ans: a

89. For which of the following materials the saturation value is the highest ?
(a) Ferromagnetic materials
(6) Paramagnetic materials
(c) Diamagnetic materials
(d) Ferrites
Ans: d

90. The magnetic materials exhibit the property of magnetisation because of
(a) orbital motion of electrons
(b) spin of electrons
(c) spin of nucleus
(d) either of these
(e) all of the above
Ans: c

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