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Electromagnetic Induction Quiz-10

Dear Readers,

As per analysis for previous years, it has been observed that students preparing for NEET find Physics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Biology due to their medical background. 


Furthermore, sections such as Physics are dominantly based on theories, laws, numerical in comparison to a section of Biology which is more of fact-based, life sciences, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced. 



Q91. Mutual inductance of two coils can be increased by
  •  Decreasing the number of turns in the coils
  •  Increasing the number of turns in the coils
  •  Winding the coils on wooden core
  •  None of the above
Solution
Increasing the number of turns in the coils

Q92.According to phenomenon of mutual inductance
  •  The mutual inductance does not dependent on geometry of the two coils involved
  •  The mutual inductance depends on the intrinsic magnetic property , like relative permeability of the material
  •  The mutual inductance is independent of the magnetic property of the material
  •  Ratio of magnetic flux produced by the coil 1 at the place of the coil 2 and the current in the coil 2 will be different from that of the ratio defined by interchanging the coils
Solution
Magnetic induction depends upon the magnetic permeability of medium between the coils (μr) or nature of material on which two coils are wound.

Q93. The self inductance of a coil is L. Keeping the length and area same, the number of turns in the coil is increased to four times. The self inductance of the coil will now be
  •   1/4 L
  •  L
  •  4L
  •  16 L
Solution
L∝N2

Q94. A copper disc of radius 0.1 m is rotated about its centre with 20 rev-s-1 in a uniform magnetic field of 0.1 T with its plane perpendicular to the field. The emf induced across the radius of the disc is
  •  π/20 V
  •  π/10 V
  •  20π mV
  •  10π mV
Solution
                        



Q95.Two coils have a mutual inductance 0.005 H. The current changes in the first coil according to equation I=I0 sin⁡ωt, where I0 =10A and ω=100π radian/sec. The maximum value of e.m.f. in the second coil is
  •  
  •  
  •  π
  •  
Solution
                             



Q96. If a copper ring is moved quickly towards south pole of a powerful stationary bar magnet, then
  •  Current flows through the copper ring
  •  Voltage in the magnet increase
  • Current flows in the magnet
  •  Copper ring will get magnetised
Solution
Magnetic flux linked with the ring changes so current flows through it

Q97.To induce an e.m.f. in a coil, the linking magnetic flux
  •  Must decrease
  •  Can either increase or decrease
  •  Must remain constant
  •  Must increase
Solution
Can either increase or decrease

Q98.The two rails of a railway track insulated from each other and the ground are connected to a milli-voltmeter. What is the reading of the mV, when a train travels at a speed of 180 kmh-1 along the track, given that the horizontal components of earth’s magnetic field is 0.2×10-4 Wbm-2 and the rails are separated by 1 m
  •  10-2 mV
  •  10 mV
  •  100 mV
  •  1 m V
Solution
                         



Q99.Two conducting circular loops of radii R1 and R2 are placed in the same plane with their centres coinciding. If R1≫R2, the mutual inductance M between them will be directly proportional to
  •  R1/R2
  •  R2/R1
  •  R12/R2
  •  R22/R1
Solution
                         



Q100. The self-inductance of the motor of an electric fan is 10 H. In order to impart maximum power at 50 Hz, it should be connected to a capacitance of f
  •  4 μF
  •  8 μF
  •  1 μF
  • 2 μF
Solution
                         


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