P11 EM (6) - Induction and AC

How was electricity generated before the discovery of induction?

• Batteries

• Motors

• Hydroelectric dams

• Fossil fuels

Who discovered electromagnetic induction?

• Benjamin Franklin

• Hans Oersted

• Michael Faraday

• Heinrich Lenz

Who determined the direction of electromagnetically induced current?

• Benjamin Franklin

• Hans Oersted

• Michael Faraday

• Heinrich Lenz

Induction was produced by Faraday's ring when

• Current flowed in the primary coil

• No current flowed through the primary coil

• Current was increasing in the primary coil

• Current was increasing or decreasing in the primary coil

Which of the following would not increase electromagnetic induction?

• Coiling the conductor

• Moving the magnet more quickly

• Increasing conductor loops

• Using a weaker magnet

Metal detectors work by detecting

• Electric current in a nearby metal

• A magnetic field in nearby metal

• The heat produced by a nearby metal

• The voltage in a nearby metal

What did Lenz use to make his discovery?

• The law of conservation of mass

• The law of conservation of energy

• The law of gravitation

• The law electromagnetic theory

What form of energy is the source of the electricity when a magnet and coil are used?

• Kinetic

• Gravitational potential

• Chemical potential

• Electromagnetic

Where is the magnetic north of the solenoid?

• The left

• The right

• The top

• The bottom

What direction is the electric current in the solenoid?

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