Who discovered electromagnetic induction?
a) James Clerk Maxwell
b) Michael Faraday
c) Nikola Tesla
d) Thomas Edison
What is electromagnetic induction?
a) The generation of an electric current due to a changing magnetic field
b) The process of creating a magnetic field using electricity
c) The conversion of electrical energy into heat
d) The attraction between two magnets
Which law governs electromagnetic induction?
a) Ohm’s Law
b) Newton’s Law
c) Faraday’s Law
d) Kirchhoff’s Law
According to Lenz’s Law, the induced current in a conductor flows in a direction that:
a) Increases the applied voltage
b) Supports the change in magnetic flux
c) Opposes the change in magnetic flux
d) Increases resistance
What is the SI unit of magnetic flux?
a) Tesla
b) Weber
c) Henry
d) Coulomb
Which of the following factors affects the magnitude of the induced emf?
a) Strength of the magnetic field
b) Speed of movement of the conductor
c) Number of turns in the coil
d) All of the above
A device that operates based on electromagnetic induction is:
a) Transformer
b) Battery
c) Capacitor
d) Resistor
Which of the following is an application of electromagnetic induction?
a) Electric generator
b) Microphone
c) Induction stove
d) All of the above
If the number of turns in a coil is doubled, the induced emf will:
a) Remain the same
b) Be halved
c) Double
d) Become zero
Which of the following causes an increase in induced current?
a) Decreasing the strength of the magnetic field
b) Moving the conductor slowly
c) Increasing the speed of relative motion between conductor and magnet
d) Using a smaller coil
What is the principle behind the working of an AC generator?
a) Ohm’s Law
b) Faraday’s Law of Electromagnetic Induction
c) Kirchhoff’s Voltage Law
d) Newton’s Third Law
In a transformer, the primary coil has more turns than the secondary coil. This is a:
a) Step-up transformer
b) Step-down transformer
c) Isolation transformer
d) Auto-transformer
What does an eddy current cause in a conductor?
a) Reduced resistance
b) Increased efficiency
c) Energy loss in the form of heat
d) Increased magnetic field
The phenomenon of producing an induced emf in a coil due to a changing current in a nearby coil is called:
a) Self-induction
b) Mutual induction
c) Permanent magnetism
d) Ferromagnetism
Which material is used in transformer cores to reduce eddy currents?
a) Solid iron
b) Laminated silicon steel
c) Copper
d) Wood
Which rule is used to determine the direction of induced current?
a) Fleming’s Left-Hand Rule
b) Fleming’s Right-Hand Rule
c) Ampere’s Rule
d) Ohm’s Law
What is the function of a commutator in a DC generator?
a) Converts DC to AC
b) Converts AC to DC
c) Increases resistance
d) Reduces voltage
The opposition to current flow due to self-induced emf in a coil is called:
a) Capacitance
b) Reactance
c) Inductive reactance
d) Resistance
What happens to the induced emf if the speed of a rotating coil in a magnetic field is doubled?
a) Remains the same
b) Doubles
c) Becomes zero
d) Halves
Which electrical component stores energy in a magnetic field?
a) Capacitor
b) Inductor
c) Resistor
d) Diode
An increase in the resistance of a circuit will:
a) Increase the induced emf
b) Decrease the induced emf
c) Have no effect on induced emf
d) Convert emf into AC
What is the basic principle behind wireless charging?
a) Faraday’s Law of Induction
b) Newton’s Third Law
c) Ohm’s Law
d) Coulomb’s Law
Which quantity remains constant in an ideal transformer?
a) Voltage
b) Power
c) Current
d) Resistance
A moving conductor in a magnetic field produces:
a) Resistance
b) Emf
c) Current only if a circuit is complete
d) Both b and c
The primary function of an electric generator is to:
a) Convert electrical energy into mechanical energy
b) Convert mechanical energy into electrical energy
c) Store charge
d) Reduce voltage
What happens when the number of turns in a solenoid increases?
a) The induced emf decreases
b) The induced emf increases
c) The magnetic field disappears
d) There is no effect on emf
A magnetic field that remains constant over time will induce:
a) A strong current
b) No current
c) A voltage spike
d) A short circuit
The unit of inductance is:
a) Weber
b) Henry
c) Tesla
d) Ampere
An alternating current generator produces electricity by:
a) Chemical reaction
b) Electromagnetic induction
c) Static electricity
d) Ohm’s Law
