Electromagnetic Induction
Physics ⇒ Electricity and Magnetism
Electromagnetic Induction starts at 10 and continues till grade 12.
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See sample questions for grade 10
A bar magnet is moved rapidly into a coil. The induced current is larger than when it is moved slowly. Explain why.
A magnet is dropped through a coil connected to a sensitive galvanometer. The galvanometer shows a deflection as the magnet falls. Explain why.
A rectangular loop is moved with velocity v perpendicular to a uniform magnetic field B. What is the expression for the induced emf if the length of the side in the field is l?
Describe one practical application of electromagnetic induction in daily life.
A bar magnet is moved rapidly into a coil. The induced current is larger than when it is moved slowly. Explain why.
A coil of 200 turns encloses an area of 0.01 m². It is placed perpendicular to a magnetic field of 0.5 T. If the field is reduced to zero in 0.2 s, what is the average induced emf?
A coil of 50 turns is removed from a magnetic field, reducing the flux from 0.1 Wb to 0 in 0.5 s. What is the induced emf?
A magnet is dropped through a coil connected to a sensitive galvanometer. The galvanometer shows a deflection as the magnet falls. Explain why.
A coil is rotated in a uniform magnetic field. What type of current is produced? (1) Direct current (2) Alternating current (3) No current (4) Pulsating current
Which law gives the direction of induced current in a conductor? (1) Ohm's Law (2) Lenz's Law (3) Ampere's Law (4) Coulomb's Law
Which of the following devices works on the principle of electromagnetic induction? (1) Electric motor (2) Transformer (3) Battery (4) Solar cell
Which of the following factors does NOT affect the magnitude of induced emf? (1) Number of turns (2) Rate of change of magnetic flux (3) Resistance of the coil (4) Strength of the magnetic field
A coil is placed in a time-varying magnetic field. The induced emf is maximum when the rate of change of magnetic flux is ________.
Electromagnetic induction is the process of generating ________ in a conductor by changing the magnetic field around it.
If the number of turns in a coil is doubled, the induced emf will be ________.
If the rate of change of magnetic flux is tripled, the induced emf will be ________.
A transformer works on the principle of electromagnetic induction. Yes or No?
If the direction of motion of a conductor in a magnetic field is reversed, the direction of induced current will also reverse. True or False?
If the magnetic field through a coil is constant, will there be any induced emf?
True or False: A current is induced in a closed loop only when the magnetic flux through the loop changes.
