ONLINE MCQ EE-ELECTROMAGNETIC INDUCTION 4

Q31. A 200 turn coil has an inductance of 12
mH. If the number of turns is increased
to 400 turns, all other quantities (area,
length etc.) remaining the same, the
inductance will be
 A.  6 mH
 [Wrong Answer]
 B.  14 mH
 [Wrong Answer]
 C.  24 mH
 [Wrong Answer]
 D.  48 mH
 [Correct Answer]
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Q32. A conductor 2 metres long moves at
right angles to a magnetic field of flux density 1 tesla with a velocity of 12.5
m/s. The induced e.m.f. in the conductor
will be
 A.  10 V
 [Wrong Answer]
 B.  15 V
 [Wrong Answer]
 C.  25 V
 [Correct Answer]
 D.  50 V
 [Wrong Answer]
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Q33. A coil induces 350 mV when the current
changes at the rate of 1 A/s. The value
of inductance is
 A.  3500 mH
 [Wrong Answer]
 B.  350 mH
 [Correct Answer]
 C.  250 mH
 [Wrong Answer]
 D.  150 mH
 [Wrong Answer]
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Q34. As per Faraday’s laws of electromagnetic
induction, an e.m.f. is induced in
a conductor whenever it
 A.  lies perpendicular to the magnetic
flux
 [Wrong Answer]
 B.  lies in a magnetic field
 [Wrong Answer]
 C.  cuts magnetic flux
 [Correct Answer]
 D.  moves parallel to the direction of
the magnetic field
 [Wrong Answer]
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Q35. If current in a conductor increases then
according to Lenz’s law self-induced
voltage will
 A.  aid the increasing current
 [Wrong Answer]
 B.  tend to decrease the amount of current
 [Wrong Answer]
 C.  produce current opposite to the increasing
current
 [Correct Answer]
 D.  aid tite applied voltage
 [Wrong Answer]
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Q36. In case of an inductance, current is
proportional to
 A.  voltage across the inductance
 [Wrong Answer]
 B.  magnetic field
 [Correct Answer]
 C.  both (a) and (b)
 [Wrong Answer]
 D.  neither (a) nor (b)
 [Wrong Answer]
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Q37. Two coils have self-inductance of 10 H
and 2 H, the mutual inductance being
zero. If the two coils are connected in
series, the total inductance will be
 A.  6 H
 [Wrong Answer]
 B.  8 H
 [Wrong Answer]
 C.  12 H
 [Correct Answer]
 D.  24 H
 [Wrong Answer]
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Q38. Lenz’s law is a consequence of the law
of conservation of
 A.  induced current
 [Wrong Answer]
 B.  charge
 [Wrong Answer]
 C.  energy
 [Correct Answer]
 D.  induced e.m.f.
 [Wrong Answer]
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Q39. The property of coil by which a counter
e.m.f. is induced in it when the current
through the coil changes is known as
 A.  self-inductance
 [Correct Answer]
 B.  mutual inductance
 [Wrong Answer]
 C.  series aiding inductance
 [Wrong Answer]
 D.  capacitance
 [Wrong Answer]
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Q40. The direction of induced e.m.f. can be
found by
 A.  Laplace’s law
 [Wrong Answer]
 B.  Lenz’s law
 [Correct Answer]
 C.  Fleming’s right hand rule
 [Wrong Answer]
 D.  Kirchhoffs voltage law
 [Wrong Answer]
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ONLINE MCQ EE-ELECTROMAGNETIC INDUCTION 5
ONLINE MCQ EE-ELECTROMAGNETIC INDUCTION 3

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