Most recently Magnetism and Electromagnetism Multiple choice Questions and Answers pdf

42. 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
Ans: b

43. 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
Ans: a

44. One maxwell is equal to
(a) 10  webers  
(b) 10  webers
(c) 10  webers  
(d) 10  webers
Ans: d

46. When two ends of a circular uniform wire are joined to the terminals of a battery, the field 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
Ans: d

47. Susceptibility is positive for
(a) non-magnetic substances
(b) diamagnetic substances
(c) ferromagnetic substances
(d)     none of the above
Ans: c

48. Two long parallel conductors carry 100 A. If the conductors are separated by 20 mm, the force per metre of length of each conductor will be
(a) 100 N
(b) 10 N
(c) 1 N
(d) 0.1 N
Ans: d

49. 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
(a) 240 N
(6) 24 N
(c) 2.4 N
(d) 0.24 N
Ans: c

50. 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
(a) 8 N-m
(b) 0.48 N-m
(e) 0.048 N-m
(d) 0.0048 N-m
[Hint. Torque = 2BIlNr N-m]
Ans: c

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