Quiz on Magnetic Induction

What do you observe when the magnet is moved into and out of the coil?

What do you think causes the movement of the galvanometer’s needle?

How can we relate this to electricity generation, particularly in local hydroelectric or geothermal plants?

What does Faraday’s Law of Induction state?

• A current-carrying wire generates a magnetic field

• A changing magnetic field induces an EMF

• Opposing magnetic fields attract each other

• Magnetic fields can only exist in permanent magnets

According to Lenz’s Law, the induced current in a conductor always:

• Increases the magnetic flux that caused it

• Opposes the change in magnetic flux

• Moves in the same direction as the applied magnetic field

• Has no relation to the changing magnetic field

What happens to the needle of a galvanometer when a magnet is moved in and out of a coil?

• It stays still

• It moves only when the magnet is inside the coil

• It moves, indicating an induced current

• It stops working

In a hydroelectric power plant, electricity is generated when:

• Water directly powers electrical devices

• Flowing water spins a turbine, changing magnetic flux in a generator

• Water is converted into electricity through chemical reactions

• Heat from the water generates power

What is the function of a geothermal power plant?

• It burns coal to generate electricity

• It uses the sun’s energy to produce power

• It converts Earth’s heat into electrical energy

• It stores electricity for later use

In the problem-solving example from the presentation, what happens when the magnetic field strength increases?

• The induced EMF remains constant

• The induced EMF increases

• The magnetic field has no effect on EMF

• The EMF decreases over time

Which of the following is NOT a requirement for electromagnetic induction?

• A conductor (such as a wire)

• A changing magnetic field

• A power supply

• Relative motion