Quiz  /  Inductance Class 12 MCQ Questions With Answers

  • 1. 
    Inductance is measured in __________.

  • Ohms
  • Farads
  • henrys
  • RPMs

  • 2. 
    __________ affects a DC circuit only when the current is first turned on, turned off, or when there is a charge in the load resistance.

  • capacitance
  • Inductance
  • A time delay
  • A relay

  • 3. 
    Which of the following is the correct formula for calculating total parallel inductive reactance in a parallel circuit?

  • XLT = XL1 + XL2 + XL3 ...
  • XLT = XL1 * XL2 * XL3...
  • XLT = 1/[(1/XL1) + (1/XL2) + (1/XL3) ... ]
  • XLT = (1/XL1) + (1/XL2) + (1/XL3) ...

  • 4. 
    Magnetic flux depends on

  • Magnetic Field
  • Area
  • Angle between Magnetic Field and Area Vector
  • All of the above

  • 5. 
    Where is the energy being stored in an inductor carrying a steady current ?

  • In the electric field of the coil
  • In the circuit
  • In the power supply
  • In the magnetic field of the coil

  • 6. 
    Which of the following has the largest inductance?

  • A solenoid of radius 1 cm, length 5 cm, and with 100 turns of wire per centimeter
  • A solenoid of radius 3 cm, length 1 cm, and with 100 turns of wire per centimeter
  • A solenoid of radius 2 cm, length 2 cm, and with 100 turns of wire per centimeter
  • A solenoid of radius 1 cm, length 1 cm, and with 200 turns of wire per centimeter
  • A solenoid of radius 2 cm, length 5 cm, and with 100 turns of wire per centimeter

  • 7. 
    If you wrap more coils around an electromagnet, it will become...

  • brighter
  • stronger
  • weaker
  • invisible

  • 8. 
    In the diagram shown, which current is changingmore rapidly?

  • Current 𝐼1
  • Current 𝐼2
  • Both are constant
  • Both are changing at the same rate
  • Both are zero

  • 9. 
    A 5.6 mH inductor is connected to a current source.What is the magnitude of the voltage in the inductorat time 𝑡 = 4.0 𝑠 if the current is 𝐼(𝑡) = 10.0 + 9.0𝑡 −3.0𝑡^2?

  • 11 mV
  • 22 mV
  • 84 mV
  • 58 mV
  • 185 mV

  • 10. 
    Energy can be stored in many ways. What is theprimary energy storage form of an inductor?

  • Kinetic
  • Electric field
  • Magnetic field
  • Gravitational field
  • Spring displacement

  • 11. 
    A 7.2 mH inductor is connected to a current source. What is the magnitude of the voltage in the inductor at time 𝑡 = 3.0 𝑠 if the current is 𝐼(𝑡) = 5.0 + 7.0𝑡 − 2.0𝑡^2?

  • 22 mV
  • 36 mV
  • 58 mV
  • 90 mV
  • 230 mV

  • 12. 
    Which of the following are units for inductance?I. HenryII. Joules/(Ampere)2III. Volt . second/Ampere

  • I only
  • II only
  • III only
  • I and II only
  • I, II and III

  • 13. 
    The voltage induced across an inductor is inversely proportional to the rate of change of magnetic flux.

  • true
  • false

  • 14. 
    The diagram shows an inductor that is part of a circuit. The direction of the emf induced in the inductor is indicated. Which of the following is possible?

  • The current is constant and rightward
  • The current is constant and leftward
  • The current is increasing and rightward
  • The current is increasing and leftward
  • None of the above

  • 15. 
    How much energy is stored in a long solenoid with 660 turns, length 𝐿 = 3.2 𝑚, and cross sectional area 𝐴 = 121 𝑐𝑚^2, when the current in it is 𝐼 = 85 𝐴?

  • 1.10 𝑚𝐽
  • 1.10 𝑘𝐽
  • 9.1 1𝑘𝐽
  • 5.21 𝑘𝐽
  • 7.48 𝑘𝐽

  • 16. 
    The most practical way to change the magnetic field of an inductor is to increase or decrease the current through the coil.

  • false
  • true

  • 17. 
    A 10-turn ideal solenoid has an inductance of 3.5 mH. When the solenoid carries a current of 2.0 A the magnetic flux through each turn is:

  • 0 Wb
  • 3.5 x 10^–4 Wb
  • 7.0 x 10^–4 Wb
  • 7.0 x 10^–3 Wb
  • 7.0 x10^–2 Wb

  • 18. 
    Current is maximum in AC generator when

  • Area Vector is parallel to magnetic field
  • Area Vector is Antiparallel to magnetic field
  • Area Vector is 120 degree with magnetic field
  • Area Vector is Perpendicular to magnetic field

  • 19. 
    A long narrow solenoid has length ℓ and a total of N turns, each of which has cross-sectional area A. Its inductance is:

  • μ0 N^2 Aℓ
  • μ0 N^2 A/ℓ
  • μ0 NA/ℓ
  • μ0 N^2 ℓ/A
  • none of these

  • 20. 
    Which of the following factors DOES NOT affect the self inductance of a coil?

  • The length of the coil
  • The current flows in the coil
  • The number of turn of the coil
  • The cross sectional area of the coil

  • 21. 
    The phenomenon due to which there is an induced current in one coil due to the current in a neighboring coil is?

  • Mutual induction
  • Steady current
  • Electromagnetism
  • Self induction

  • 22. 
    A 10-turn ideal solenoid has an inductance of 4.0 mH. To generate an emf of 2.0 V the current should change at a rate of:

  • 0 A/s
  • 0.5 A/s
  • 50 A/s
  • 250 A/s
  • 500 A/s

  • 23. 
    How large a current must flow through a 1.2 H inductance so that the energy stored is 393 J?

  • 1.17 A
  • 2.31 A
  • 25.6 A
  • 44.2 A
  • 107.1 A

  • 24. 
    The production of electric current by a changing magnetic field is called ____________________________________.

  • induced current
  • electromotive force
  • electromagnetic induction
  • internal resistance
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