Quiz on Magnetic Induction

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

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

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

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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