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NEET Physics: Electromagnetic Induction Practice Questions

15 free multiple-choice questions on Electromagnetic Induction for NEET Physics, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.

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  1. Q1. According to Faraday's law of electromagnetic induction, the magnitude of the induced EMF is proportional to:

    • Athe rate of change of magnetic flux
    • Bthe rate of change of magnetic field strength
    • Cthe area of the coil
    • Dthe product of magnetic flux and current
    Show answer & explanation

    Correct answer: A — the rate of change of magnetic flux

    Faraday's law states that the magnitude of the induced EMF is equal to the rate of change of magnetic flux linked with the circuit.

  2. Q2. An object is moved perpendicular to a uniform magnetic field. If the magnetic field is constant, what is the change in magnetic flux linked with the object?

    • AThe magnetic flux remains zero
    • BThe magnetic flux changes continuously
    • CThe magnetic flux changes only if the object is moving in a circle
    • DThe magnetic flux changes only at the endpoints
    Show answer & explanation

    Correct answer: D — The magnetic flux changes only at the endpoints

    Magnetic flux is defined as Φ_B = B A cos θ. If the area (A) is constant and the motion is perpendicular to B, the flux Φ_B changes only if the area swept changes, which occurs if the object moves or the field changes. For a constant field and fixed area, the flux remains constant unless the path is altered. (Here, the question implies movement, so flux changes if the area changes).

  3. Q3. When a magnetic flux changes through a circuit, the induced current flowing in the circuit will flow in a direction that:

    • AIs parallel to the magnetic field lines
    • BOpposes the change in flux
    • CEnhances the change in flux
    • DIs in the same direction as the change in flux
    Show answer & explanation

    Correct answer: B — Opposes the change in flux

    Lenz's Law states that the induced current flows in a direction that opposes the change in magnetic flux that produced it.

  4. Q4. Lenz's law is a consequence of the conservation of energy. When a magnetic flux linked with a coil is increased, the induced current will flow in a direction that produces a magnetic field opposing the change in flux. This opposition is known as:

    • Amagnetic repulsion
    • BLenz's law
    • Cmagnetic attraction
    • Dmagnetic induction
    Show answer & explanation

    Correct answer: B — Lenz's law

    Lenz's law dictates that the induced current flows in a direction that opposes the change in magnetic flux that caused it. This opposition is the principle of Lenz's law.

  5. Q5. In electromagnetic induction, the magnetic flux is defined as the measure of:

    • AThe magnetic field strength at a point
    • BThe rate of flow of magnetic lines
    • CThe magnetic field divided by the area
    • DThe total magnetic field passing through a given area
    Show answer & explanation

    Correct answer: D — The total magnetic field passing through a given area

    Magnetic flux (Φ) is the measure of the total magnetic field passing through a given surface area.

  6. Q6. If the magnetic flux passing through a closed loop is doubled in one second, what happens to the magnitude of the induced EMF?

    • AIt is halved
    • BIt is quadrupled
    • CIt is doubled
    • DIt remains the same
    Show answer & explanation

    Correct answer: C — It is doubled

    Faraday's Law states mathcalE = -dΦ_B/dt. If the flux (Φ_B) doubles in time, the rate of change (dΦ_B/dt) also doubles, thus the induced EMF is doubled.

  7. Q7. If the magnetic flux changing through a circuit is zero, what can be concluded about the induced EMF?

    • AThe induced EMF is maximum
    • BThe induced EMF is zero
    • CThe induced EMF is dependent on resistance
    • DThe induced EMF is non-zero
    Show answer & explanation

    Correct answer: B — The induced EMF is zero

    According to Faraday's Law, if the rate of change of magnetic flux (dΦ/dt) is zero, the induced EMF (mathcalE) across the circuit must be zero.

  8. Q8. When the magnetic flux linked with a closed loop is changing, what principle dictates the direction of the induced electromotive force (EMF)?

    • AGauss's law
    • BLenz's law
    • CAmpere's law
    • DFaraday's law of induction
    Show answer & explanation

    Correct answer: B — Lenz's law

    Faraday's law states that the magnitude of the induced EMF is proportional to the rate of change of magnetic flux. Lenz's law, which is an extension of the law, determines the direction of the induced current, stating that the induced current flows in a direction that opposes the change in magnetic flux that produced it.

  9. Q9. If the magnetic flux linked with a coil is constant, what will be the induced EMF in the coil?

    • AEMF proportional to the rate of change of flux
    • BZero EMF
    • CInduced EMF proportional to time
    • DMaximum EMF
    Show answer & explanation

    Correct answer: B — Zero EMF

    According to Faraday's law, the induced EMF is proportional to the rate of change of magnetic flux (dΦ_B/dt). If the flux is constant, the rate of change is zero, hence the induced EMF is zero.

  10. Q10. Which of the following statements correctly describes the relationship between magnetic flux and magnetic field strength in a uniform magnetic field?

    • AFlux is independent of magnetic field strength.
    • BFlux is related to the magnetic field only when the field is non-uniform.
    • CFlux is inversely proportional to the magnetic field strength.
    • DFlux is directly proportional to the magnetic field strength.
    Show answer & explanation

    Correct answer: D — Flux is directly proportional to the magnetic field strength.

    Magnetic flux (Φ) is defined as the product of the magnetic field strength (B) and the area (A) perpendicular to it (Φ= B · A). Thus, flux is directly proportional to the magnetic field strength when the area is constant.

  11. Q11. If the magnetic field strength (B) is constant, how is the induced EMF proportional to the rate of change of magnetic flux (Φ_B)?

    • ADirectly proportional
    • BExponentially proportional
    • CInversely proportional
    • DNo correlation
    Show answer & explanation

    Correct answer: A — Directly proportional

    Faraday's Law states mathcalE = -dΦ_B/dt. Therefore, the induced EMF is directly proportional to the rate of change of the magnetic flux.

  12. Q12. When the magnetic flux linked with a coil is kept constant, what happens to the induced electromotive force (EMF)?

    • AThe induced EMF decreases linearly with time
    • BThe induced EMF remains zero
    • CThe induced EMF increases linearly with time
    • DThe induced EMF is proportional to the rate of change of magnetic flux
    Show answer & explanation

    Correct answer: B — The induced EMF remains zero

    According to Faraday's Law, the induced EMF is directly proportional to the rate of change of magnetic flux. If the flux is constant, the rate of change is zero, hence the induced EMF is zero.

  13. Q13. Lenz's law is a consequence of which principle?

    • Aconservation of momentum
    • Bconservation of charge
    • Cconservation of energy
    • Dmagnetic monopoles
    Show answer & explanation

    Correct answer: C — conservation of energy

    Lenz's law is a statement of the conservation of energy, dictating that the induced current flows in a direction that opposes the change in magnetic flux.

  14. Q14. The magnitude of the induced electromotive force (EMF) in a coil is directly proportional to:

    • AThe rate of change of magnetic flux through the coil
    • BThe current flowing through the coil
    • CThe total magnetic flux linked by the coil
    • DThe area of the coil
    Show answer & explanation

    Correct answer: A — The rate of change of magnetic flux through the coil

    According to Faraday's Law of Induction, the magnitude of the induced EMF (mathcalE) is equal to the rate of change of magnetic flux (Φ) linked with the circuit: mathcalE = -dΦ/dt.

  15. Q15. The direction of the induced current in a loop is determined using which rule?

    • AFleming's Right-Hand Rule
    • BRight-Hand Rule
    • CFleming's Left-Hand Rule
    • DRight-Hand Grip Rule
    Show answer & explanation

    Correct answer: B — Right-Hand Rule

    The Right-Hand Rule is used to determine the direction of the magnetic force or induced current based on the direction of the magnetic field and the direction of motion or change.

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