A Trivia Quiz On Electromagnetic Induction!

15 Questions | Total Attempts: 765

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A Trivia Quiz On Electromagnetic Induction!


Questions and Answers
  • 1. 
    The magnitude of EMF produced in a coil, when a magnet is inserted into it does not depend upon
    • A. 

      Number of turns in the coil

    • B. 

      Resentence of the coil

    • C. 

      Magnetic moment of magnet

    • D. 

      Speed of the magnet

  • 2. 
    The ratio of primary and secondary turns in a transformer is 1: 200. If 220-volt a.c. is fed to primary, the voltage across secondary will be 
    • A. 

      44 V

    • B. 

      220 V

    • C. 
    • D. 

      40 k V

  • 3. 
    The core of a transformer is laminated to 
    • A. 

      Reduce eddy current losses,

    • B. 

      Increase magnetic flux

    • C. 

      Increase strength of magnetic field,

    • D. 

      Increase residual magnetism.

  • 4. 
    The number of turns in the primary and the secondary of a transformer is 1000 and 3000 respectively. If 80-volt a.c. is applied to the primary coil of the transformer, then the potential difference per turn of the secondary coil would be  
    • A. 

      240 volt

    • B. 

      2400 volt

    • C. 

      0.24 volt

    • D. 

      0.08 volt

  • 5. 
    When a wire loop is related in a magnetic field the direction of included EMF change once in each.
    • A. 

      ¼ revolution

    • B. 

      ½ revolution

    • C. 

      1 revolution

    • D. 

      2 revolution

  • 6. 
    A coil wire of a certain radius has 600 turns and a self-inductance of 108 mH. The self inductance of a second similar coil of 500 turns will be:
    • A. 

      74 mH

    • B. 

      75 mH

    • C. 

      76 mH

    • D. 

      77 mH

  • 7. 
    A straight conductor of length 0.4 m is moved with a speed of 7 m/s perpendicular to a magnetic field of induction 0.9 webers per meter2. The included EMF. across the conductor is
    • A. 

      25.2 V

    • B. 

      5.04 V

    • C. 

      2.52 V

    • D. 

      1.26 V

  • 8. 
    A long solenoid has 800 turns per meter. A current of 1.6 A flows through it. The magnetic induction at the end solenoid on its axis is 
    • A. 

      16×10-4 T

    • B. 

      0.8 ×10-4 T

    • C. 

      32×10-4  T

    • D. 

      4×10-4 T

  • 9. 
    A metallic square Loop ABCD is moving in its own plane with velocity v in a uniform magnetic field perpendicular to its plane as shown in Fig. 4 (CF) .15. An electric field is induced  
    • A. 

      AD, but not in BC

    • B. 

      In BC, but not in AD,

    • C. 

      Neither in AD nor in BC

    • D. 

      In both AD and BC

  • 10. 
    Two circular coils can be arranged in any of the three situations shown in Fig. 4(CF).16. Their mutual inductance will be 
    • A. 

      Maximum in solutions (i)

    • B. 

      Maximum in solutions (ii)

    • C. 

      Maximum in situation (iii)

    • D. 

      Same in all situation

  • 11. 
    When a D.C motor operator at 200 V, its initial current is 5 A, but when it runs maximum speed, the current is only 3 A,  What is its back e.m.f.?
    • A. 

      120 V

    • B. 

      200 V

    • C. 

      80 V

    • D. 

      Zero

  • 12. 
    A conducting square loop of side L and resistance R moves in it’s a uniform velocity v perpendicular to one of its sides. A magnetic induction B constant in time and space, pointing perpendicular and into the plane of the loop exists everywhere with half the loop outside the field, as shown in Fig, 4 (CF). 18. The induced e.m.f. is
    • A. 

      BvR

    • B. 

      VBL /R

    • C. 

      VBL

    • D. 

      BLv/2

  • 13. 
    As shown in Fig. 4 (CF). 20, P, and Q are two co-axial conducting loops separated by some distance. When the switch S is closed, a clockwise current Ip flows in p ( as seen by E), and an induced current IQ1 flows in P (as seen by E ), and an induced current IQ1 flows in Q. The switch remains closed for a long time. When S is opened, a current IQ2 flows in Q. Then directions of IQ1 and IQ2 (as seen by E) are
    • A. 

      Respectively clockwise and anticlockwise

    • B. 

      Both clockwise

    • C. 

      Both anticlockwise

    • D. 

      Respectively anticlockwise and clockwise

  • 14. 
    Two coils are placed close to each other. The mutual inductance of the pair of coils depends upon 
    • A. 

      The rates at which current are changing in the two coils

    • B. 

      Relative position and orientation of the two coils

    • C. 

      The material of the wires of the coils

    • D. 

      The current in the two coils.

  • 15. 
    The magnetic flux linked with the coil varies with time as  = 3 t2 +4t + 9. The magnitude of induced EMF at t = 2 s is
    • A. 

      9 V

    • B. 

      16 V

    • C. 

      3 V

    • D. 

      4 V

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