## Electromagnetic Induction Quiz-9

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.

Q81. The magnetic field in the cylindrical region shown in figure increases at a constant rate of 20 mT/sec. Each side of the square lop ABCD has a length of 1 cm and resistance of 4Î©. Find the current in the wire AB if the switch S is closed

•  1.25×10-7 A, (anti-clockwise)
•  1.25×10-7 A, clockwise)
•  2.5×10-7 A, (anti-clockwise)
•  2.5×10-7 A, (clockwise)
Solution

Q82.A boat is moving due east in a region where the earth’s magnetic field is 5.0×10-5 NA-1 m-1 due north and horizontal. The boat carries a vertical aerial 2 m long. If the speed of the boat is 1.50ms-1, the magnitude of the induced emf in the wire of aerial is
•  0.75 mV
•  0.50 mV
•  0.15 mV
•  1 mV
Solution

Q83.  An electric potential difference will be induced between the ends of the conductor shown in the diagram, when the conductor moves in the direction

•   P
•  Q
•  L
•  M
Solution
Conductor cuts the flux only when it moves in the direction of M

Q84. The inductance of a solenoid 0.5 m long of cross-sectional area 20 cm^2 and with 500 turns is
•  12.5 mH
•  1.25 mH
•  15.0 mH
•  0.12 mH
Solution

Q85.In L-R circuit, for the case of increasing current, the magnitude of current can be calculated by using the formula
•  I=I0e-Rt/L
•  I=I0 (1-e(-Rt/L))
•  I=I0 (1-e(Rt/L))
•  I=I0eRt/L
Solution
I=I0 (1-e(-Rt/L))

Q86. A transformer connected to 220 volt line shows an output of 2 A at 11000 volt. The efficiency is 100%. The current drawn from the line is
•  100 A
•  200 A
•  22 A
•  11 A
Solution

Q87.An axle of truck is 2.5 m long. If the truck is moving due north at 30 ms^(-1) at a place where the vertical component of the earth’s magnetic field is 90Î¼T, the potential difference between the two ends of the axle is
•  6.75 mV with west end positive
•  6.75 mV with east end positive
•  6.75 mV with north end positive
•  6.75 mV with south end positive
Solution

Q88.The current is flowing in two coaxial coils in the same direction. On increasing the distance between the two, the electric current will
•  Increase
•  Decrease
•  Remain unchanged
•  The information is incomplete
Solution

Q89.AA coil of inductance 300 mH and resistance 2Î© is connected to a source of voltage 2V. The current reaches half of its steady state value in
•  0.15 s
•  0.3 s
•  0.05 s
•  0.1 s
Solution

Q90. A conducting ring of radius 1 meter is placed in an uniform magnetic field B of 0.01telsa oscillating with frequency 100Hz with its plane at right angles to B. What will be the induced electric field
•  Ï€ volt/m
•  2 volt/m
•  10 volt/m
• 62 volt/m
Solution

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