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According to Lenz’s law, what does the secondary current in a transformer produce?

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RRB JE EE 22 Apr 2025 Shift 2 CBT 2 Official Paper
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  1.  A magnetizing effect
  2. An EMF to oppose the primary voltage
  3. A back EMF that resists the load 
  4. A demagnetizing effect

Answer (Detailed Solution Below)

Option 4 : A demagnetizing effect
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Concept:

According to Lenz’s Law, the direction of the induced current is always such that it opposes the cause producing it. In a transformer, when current flows in the secondary winding, it generates a magnetic field that opposes the magnetic field of the primary coil.

This opposition is what maintains energy conservation and proper transformer action. The effect of this opposing magnetic field is referred to as a demagnetizing effect.

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More Faraday's Law Questions

Q1.In a series magnetic circuit, ___________ flux φ flows through each part of the circuit.
Q2.A coil of 100 turns is wound on a magnetic circuit of reluctance 1000 AT/mWb. The current of 1A flowing in the coil is reversed in 10 ms. The average EMF induced in the coil is ________ V.
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Q1.In a series magnetic circuit, ___________ flux φ flows through each part of the circuit.
Q2.According to Lenz’s law, what does the secondary current in a transformer produce?
Q3.A coil of 100 turns is wound on a magnetic circuit of reluctance 1000 AT/mWb. The current of 1A flowing in the coil is reversed in 10 ms. The average EMF induced in the coil is ________ V.
Q4.A 0.62m - long wire carrying 1.20 A of current is positioned in a 0.47 T uniform magnetic field that is directed perpendicularly to the wire. Find out how much magnetic force there is on the wire.
Q5.In 0.0200 seconds, the magnetic flux across an N - turn coil goes from 0.0160 Wb to 0.00800 Wb. Determine the number of turns if the coil's induced emf is 28 V
Q6.A coil having 100 turns is placed in the magnetic field of 1m wb. Find the average EMF induced if the coil is moved in 0.2 seconds from the given field to a field of 0.4m wb.
Q7.Which of the following statements are correct? (a) Lenz's law is based on the conservation of charge. (b) Lenz's law gives the direction of induced current. (c) Lenz's law is based on the conservation of energy.
Q8.In electromagnetism, the magnetic field set up by a steady current density is described by _______.
Q9.'A time varying electric field produces a magnetic field.' This phenomenon is called:
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