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NEET UG Electromagnetic Induction — practice questions

Explore 44 free Electromagnetic Induction questions in NEET UG Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Electromagnetic Induction questions and exercises with answers

Showing questions 1–30 of 44.

Faraday's law of induction states:Read the answer and worked solution →Lenz's law states that the induced current direction is such that it:Read the answer and worked solution →Motional EMF induced across a rod of length L moving with velocity v perpendicular to a field B is:Read the answer and worked solution →Self-inductance L of a coil is the proportionality between:Read the answer and worked solution →The self-inductance of a long solenoid of length ℓ, area A, with n turns per unit length is approximately:Read the answer and worked solution →Energy stored in an inductor of self-inductance L carrying current I is:Read the answer and worked solution →Mutual inductance M between two coils relates the EMF induced in coil 2 to the current in coil 1 as:Read the answer and worked solution →A transformer works on the principle of:Read the answer and worked solution →Eddy currents are reduced in transformer cores by:Read the answer and worked solution →A magnetic flux through a coil changes from 4 Wb to 1 Wb in 0.3 s. The average EMF induced is:Read the answer and worked solution →A coil of inductance 0.5 H carries a current changing at 4 A s⁻¹. The induced EMF is:Read the answer and worked solution →A bar magnet is dropped through a vertical conducting ring. The magnet:Read the answer and worked solution →Maxwell's correction to Ampère's law introduced:Read the answer and worked solution →An LC circuit oscillates with angular frequency ω equal to:Read the answer and worked solution →Faraday's law needs the notion of a quantity called magnetic:Read the answer and worked solution →Magnetic flux is defined in the same way as flux that is:Read the answer and worked solution →The induced emf equals the rate of change of flux with respect to:Read the answer and worked solution →A steady, unchanging magnetic flux through a circuit induces an emf of:Read the answer and worked solution →The negative sign in Faraday's law indicates the induced current's:Read the answer and worked solution →For a closely wound coil, the flux change through each turn is:Read the answer and worked solution →Doubling the number of turns of a coil changes the induced emf by:Read the answer and worked solution →An emf produced by moving a conductor in a field is called:Read the answer and worked solution →Motional emf shows an emf can be made without varying the:Read the answer and worked solution →Motional emf can also be explained by invoking the force named after:Read the answer and worked solution →An induced emf in a loop can be produced only by changing the:Read the answer and worked solution →A galvanometer shows no deflection when the magnet is held:Read the answer and worked solution →A current may be induced in a coil by flux change from another coil that is:Read the answer and worked solution →The flux through a coil is proportional to its:Read the answer and worked solution →Induction between two neighbouring coils is called inductance that is:Read the answer and worked solution →Mutual inductance is also called the coefficient of mutual:Read the answer and worked solution →

Worked practice questions

Faraday's law of induction states:

  1. EMF = − dΦ/dt
  2. EMF = − dΦ × dt
  3. EMF = Φ / dt
  4. EMF = − dt / dΦ
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Correct answer: A. EMF = − dΦ/dt

1. EMF induced in a circuit = − dΦ/dt, where Φ is the magnetic flux through the circuit. 2. The minus sign encodes Lenz's law (direction). 3. Flux Φ = ∫ B · dA. _Source: syllabus Physics Ch 6 §6.4 Faraday's Law_

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Lenz's law states that the induced current direction is such that it:

  1. Aids the change in flux
  2. Opposes the change in flux
  3. Is always clockwise as seen from front
  4. Vanishes after one cycle
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Correct answer: B. Opposes the change in flux

1. Lenz's law: induced current OPPOSES the change in magnetic flux producing it. 2. This is a consequence of energy conservation — otherwise we'd build a perpetual-motion device. 3. The minus sign in Faraday's law mathematically encodes Lenz's law. _Source: syllabus Physics Ch 6 §6.5 Lenz's Law_

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Motional EMF induced across a rod of length L moving with velocity v perpendicular to a field B is:

  1. EMF = B L v
  2. EMF = B L / v
  3. EMF = B v / L
  4. EMF = B / (L v)
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Correct answer: A. EMF = B L v

1. dΦ/dt = B × (rate of area swept) = B × (L v). 2. So |EMF| = B L v. 3. Direction by Lenz's law. _Source: syllabus Physics Ch 6 §6.6 Motional EMF_

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