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JEE Main Electromagnetic Induction — practice questions — page 2

Explore 59 free Electromagnetic Induction questions in JEE Main 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 31–59 of 59.

You now hold the magnet still inside the coil. The galvanometer shows:Read the answer and worked solution →You pull the magnet away instead of pushing it in. The deflection:Read the answer and worked solution →You move the same magnet faster. The deflection becomes:Read the answer and worked solution →Two coils sit still. You press the tapping key in the battery coil. The other coil's galvanometer shows:Read the answer and worked solution →You keep the key pressed for a whole minute. During that minute the galvanometer shows:Read the answer and worked solution →You slide an iron rod into the two coils along their axis. The deflection:Read the answer and worked solution →A meter reads the magnetic flux through a coil. Its reading is in:Read the answer and worked solution →Faraday's law says the induced emf equals the time rate of change of:Read the answer and worked solution →To get a bigger induced emf from the same flux change, you should:Read the answer and worked solution →A closed loop sits still between two very strong fixed magnets. Is a current induced?Read the answer and worked solution →Lenz's law says the induced current always opposes the:Read the answer and worked solution →You push a magnet towards a coil. By Lenz's law the coil pushes the magnet:Read the answer and worked solution →If the induced current helped the magnet instead, a gentle push would give endless speed. This breaks:Read the answer and worked solution →Where does the work you do pushing the magnet into the coil end up?Read the answer and worked solution →A loop moves while lying fully inside a uniform magnetic field. The induced current is:Read the answer and worked solution →A copper plate swings between the poles of a magnet and soon stops. The cause is:Read the answer and worked solution →Cutting slots in the swinging copper plate makes it:Read the answer and worked solution →Some trains brake with electromagnets held above the rails. The braking feels:Read the answer and worked solution →A magnet dropped through an aluminium pipe, compared with a PVC pipe, takes:Read the answer and worked solution →A coil is labelled 2 H. The H stands for the unit called the:Read the answer and worked solution →The coil of an AC generator connects to the outside circuit through:Read the answer and worked solution →Catch what kicks the needleRead the answer and worked solution →Pop the eddy current usesRead the answer and worked solution →Steer into the induction laneRead the answer and worked solution →Slice the induction wordsRead the answer and worked solution →Kick or no kickRead the answer and worked solution →Eddy currents, friend or foeRead the answer and worked solution →One word is wrongRead the answer and worked solution →Induction bingoRead the answer and worked solution →

Worked practice questions

You now hold the magnet still inside the coil. The galvanometer shows:

  1. Reverse kick
  2. No deflection
  3. Steady deflection
  4. Faster swings
Show answer and solution

Correct answer: B. No deflection

1. A still magnet means the flux is not changing. 2. No change in flux means no induced current. 3. The needle shows no deflection. _Source: syllabus Physics Part I, Chapter 6, Electromagnetic Induction._

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You pull the magnet away instead of pushing it in. The deflection:

  1. Reverses
  2. Doubles
  3. Vanishes
  4. Steadies
Show answer and solution

Correct answer: A. Reverses

1. Pulling the magnet away makes the flux fall instead of rise. 2. The induced current flows the other way. 3. So the deflection reverses. _Source: syllabus Physics Part I, Chapter 6, Electromagnetic Induction._

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You move the same magnet faster. The deflection becomes:

  1. Steady
  2. Bigger
  3. Smaller
  4. Absent
Show answer and solution

Correct answer: B. Bigger

1. A faster magnet changes the flux more quickly. 2. The induced emf grows with the rate of change of flux. 3. So the deflection is bigger. _Source: syllabus Physics Part I, Chapter 6, Electromagnetic Induction._

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