L11.1 Inducing Currents

What is electromagnetic induction?

• The process of generating current through a wire in a changing magnetic field.

• The process of generating a magnetic field through a wire in a changing electric field.

• The process of generating heat through a wire in a changing magnetic field.

• The process of generating light through a wire in a changing electric field.

Who discovered that a magnetic field could produce a current?

• Oersted

• Faraday

• Tesla

• Newton

What happens when a magnet is moved through a wire coil that is part of a closed electric circuit?

• An electric current is produced in the circuit.

• The wire coil heats up.

• The wire coil produces light.

• The wire coil produces sound.

What happens when the magnet stops moving in the process of electromagnetic induction?

• There is no current in the circuit.

• The current increases.

• The current decreases but does not stop.

• The current reverses direction.

What determines the direction of the current in electromagnetic induction?

• The speed of the magnet.

• The direction in which the magnet moves.

• The temperature of the wire.

• The length of the wire.

Which of the following actions will increase the strength of the induced current?

• Use a weaker magnet

• Use a wire with fewer coils

• Move the magnet slower

• Move the magnet perpendicular to the coils

What is the relationship between the strength of the magnet and the strength of the induced current?

• The strength of the current is inversely proportional to the strength of the magnet.

• The strength of the current is directly proportional to the strength of the magnet.

• The strength of the current is not affected by the strength of the magnet.

• The strength of the current decreases as the strength of the magnet increases.

How does the number of coils in the wire affect the strength of the induced current?

• More coils result in a weaker current.

• The number of coils does not affect the current.

• More coils result in a stronger current.

• Fewer coils result in a stronger current.

What effect does the speed of the magnet have on the strength of the induced current?

• Faster motion results in a weaker current.

• The speed of the magnet does not affect the current.

• Faster motion results in a stronger current.

• Slower motion results in a stronger current.

What is the potential difference given to the charges by a battery called?

• Current

• Resistance

• Electromotive force

• Magnetic field