Electromagnetic Induction
Physics ⇒ Electricity and Magnetism
Electromagnetic Induction starts at 10 and continues till grade 12.
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A rectangular loop of wire is pulled with constant velocity out of a region of uniform magnetic field. What happens to the induced current in the loop as it leaves the field?
Define self-induction.
Describe the working principle of an electric generator based on electromagnetic induction.
Explain the difference between self-induction and mutual induction.
A coil of 200 turns is placed in a uniform magnetic field of 0.5 T. If the area of the coil is 0.02 m2 and the plane of the coil is perpendicular to the field, calculate the magnetic flux linked with the coil.
A metal rod of length 1 m moves with a velocity of 10 m/s perpendicular to a magnetic field of 0.2 T. What is the induced emf across the ends of the rod?
A rectangular loop of wire is pulled with constant velocity out of a region of uniform magnetic field. What happens to the induced current in the loop as it leaves the field?
A solenoid of length 0.5 m and 1000 turns carries a current that increases uniformly from 0 to 5 A in 0.1 s. If the cross-sectional area is 2 × 10-3 m2, calculate the average emf induced across the solenoid.
A coil of 100 turns is rotated in a uniform magnetic field at a constant angular velocity. What type of emf is produced?
(1) Direct emf
(2) Alternating emf
(3) No emf
(4) Pulsating emf
Which device works on the principle of mutual induction?
(1) Electric motor
(2) Transformer
(3) Galvanometer
(4) Voltmeter
Which law gives the direction of induced current in a closed loop?
(1) Faraday's law
(2) Lenz's law
(3) Ampere's law
(4) Ohm's law
Which of the following factors does NOT affect the magnitude of the 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: According to Faraday's second law, the magnitude of induced emf is equal to the ________ of change of magnetic flux linkage.
Fill in the blank: The direction of induced current can be determined by ________ right-hand rule.
Fill in the blank: The phenomenon of generating emf by changing the area of a coil in a magnetic field is called ________ induction.
The coefficient of self-induction (inductance) is measured in ________.
True or False: Lenz's law is a consequence of the law of conservation of energy.
True or False: The direction of induced emf can be determined using Fleming's left-hand rule.
True or False: The induced emf in a closed loop is always in such a direction as to oppose the cause that produces it.
True or False: The induced emf is zero if the magnetic flux through a coil does not change with time.
