Mutual Inductance, L-C Oscillations and Transformers questions with solutions

Showing 1–10 of 57 questions

• NumericmediumElectromagnetic InductionMutual Inductance, L-C Oscillations and Transformers

  An ideal transformer has 500 primary turns and 100 secondary turns. A 20 Ω resistor is connected across the secondary and the primary is supplied with 200 V RMS. Determine the primary RMS current, in ampere.

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• MCQmediumElectromagnetic InductionMutual Inductance, L-C Oscillations and Transformers

  Two conducting circular loops A and B are placed in the same plane with their centres coinciding as shown in figure. The mutual inductance between them is:

  

  Options

  • Option A

    μ₀πa²/(2b)

  • Option B

    μ₀b²/(2πa)

  • Option C

    μ₀πb²/(2a)

  • Option D

    μ₀a²/(2πb)

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  JEE Mains 2024 05 Apr Morning Shift

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• Multi-correctmediumElectromagnetic InductionMutual Inductance, L-C Oscillations and Transformers

  Which statements about eddy currents are correct?

  Select all that apply

  • Option A

    They are used in electromagnetic braking.

  • Option B

    They are used in induction heating.

  • Option C

    They can cause unwanted transformer-core loss.

  • Option D

    Their direction is governed by Lenz's law.

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• NumericmediumElectromagnetic InductionMutual Inductance, L-C Oscillations and Transformers

  Two concentric circular coils of radii 1 cm and 1000 cm, with 10 and 200 turns respectively, are coaxial with coinciding centres. The mutual inductance is ______ × 10⁻⁸ H. [Take π² = 10]

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  JEE Mains6 April 2023Shift 2Evening Shift

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• MCQmediumElectromagnetic InductionMutual Inductance, L-C Oscillations and Transformers

  Two identical metal plates fall through the same localized magnetic-field region. One is solid and the other has many narrow longitudinal slots. Which plate experiences stronger magnetic braking?

  Options

  • Option A

    The solid plate.

  • Option B

    The slotted plate.

  • Option C

    Both equally.

  • Option D

    Neither plate.

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• Multi-correctmediumElectromagnetic InductionMutual Inductance, L-C Oscillations and Transformers

  A transformer has constant iron loss 400 W and full-load copper loss 900 W. Secondary voltage is approximately constant with load. Which statements are correct?

  Select all that apply

  • Option A

    Maximum efficiency occurs at two-thirds of full-load current.

  • Option B

    At maximum efficiency copper loss is 400 W.

  • Option C

    At maximum efficiency total internal loss is 800 W.

  • Option D

    Maximum efficiency occurs when copper loss equals iron loss.

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• MCQmediumElectromagnetic InductionMutual Inductance, L-C Oscillations and Transformers

  A capacitor of capacitance 100 μF is charged to a potential of 12 V and connected to a 6.4 mH inductor to produce oscillations. The maximum current in the circuit would be :

  Options

  • Option A

    3.2 A

  • Option B

    1.5 A

  • Option C

    2.0 A

  • Option D

    1.2 A

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  JEE Mains 2024 29 Jan Morning Shift

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• NumericmediumElectromagnetic InductionMutual Inductance, L-C Oscillations and Transformers

  An ideal transformer with purely resistive load operates at 12 kV on the primary side. It supplies electrical energy to nearby houses at 120 V. The average rate of energy consumption is 60 kW. The value of resistive load Rₛ required in the secondary circuit is ______ mΩ.

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  JEE Mains6 April 2023Shift 1Morning Shift

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• MCQmediumElectromagnetic InductionMutual Inductance, L-C Oscillations and Transformers

  The primary and secondary coils of a transformer have 50 and 1500 turns respectively. If the total magnetic FLUX LINKAGE of the primary is Φₚ = Φ₀ + 4t (in weber-turns), find the output voltage across the secondary coil.

  Options

  • Option A

    120 V

  • Option B

    220 V

  • Option C

    30 V

  • Option D

    90 V

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  AIPMT 2007NEET Previous Year

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• Multi-correctmediumElectromagnetic InductionMutual Inductance, L-C Oscillations and Transformers

  A thick metallic plate oscillates between the poles of a strong electromagnet. When the field is switched on, the oscillations die out rapidly. Which statements are correct?

  Select all that apply

  • Option A

    Eddy currents are induced in the plate.

  • Option B

    Magnetic forces associated with eddy currents oppose the motion.

  • Option C

    Mechanical energy is converted mainly into heat.

  • Option D

    Cutting narrow slots in the plate can reduce damping.

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