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 11
A magnet is dropped through a coil connected to a galvanometer. The galvanometer shows a deflection. Explain why.
A rectangular loop of wire is pulled out of a magnetic field at a constant speed. What is the direction of the induced current?
Describe the difference between self-induction and mutual induction.
Explain why a current is induced in a coil when a magnet is moved towards it.
A coil of 100 turns is placed in a uniform magnetic field. If the magnetic flux through each turn changes by 0.02 Wb in 0.1 s, what is the average induced emf?
A coil of 200 turns is placed in a magnetic field. If the magnetic flux changes from 0.3 Wb to 0 in 0.5 s, calculate the average induced emf.
A magnet is dropped through a coil connected to a galvanometer. The galvanometer shows a deflection. Explain why.
A rectangular loop of wire is pulled out of a magnetic field at a constant speed. What is the direction of the induced current?
A coil is rotated in a uniform magnetic field. What type of emf is produced?
(1) Direct emf
(2) Alternating emf
(3) No emf
(4) Constant emf
Which law gives the direction of induced current?
(1) Faraday's law
(2) Lenz's law
(3) Ohm's law
(4) Ampere's law
Which of the following devices works on the principle of electromagnetic induction?
(1) Electric motor
(2) Transformer
(3) Electric heater
(4) Voltmeter
Which of the following factors does NOT affect the magnitude of induced emf in a coil?
(1) Number of turns in the coil
(2) Rate of change of magnetic flux
(3) Resistance of the coil
(4) Strength of the magnetic field
Fill in the blank: The induced emf in a circuit is proportional to the ________ of change of magnetic flux.
If the number of turns in a coil is doubled, the induced emf will be ________ (assuming all other factors remain constant).
The direction of induced current can be determined by ________ law.
The phenomenon of generating emf by changing the magnetic field is called ________.
If the magnetic flux through a loop is constant, the induced emf is zero. Yes or No?
True or False: Lenz's law states that the direction of induced current is such that it opposes the change in magnetic flux that produced it.
True or False: The induced emf in a closed loop is independent of the rate of change of magnetic flux.
True or False: The induced emf is always in a direction that aids the change in magnetic flux.
