Exploring Current and Magnetism (19 Quiz II)

What is the unit of magnetic field strength?

• Tesla

• Newton

• Joule

• Watt

Which law explains the principle of electromagnetic induction?

• Ohm's Law

• Faraday's Law

• Newton's Third Law

• Coulomb's Law

In a simple electric motor, what is the role of the commutator?

• To increase the current

• To reverse the direction of current

• To decrease the voltage

• To store energy

How does increasing the number of coils in a generator affect the induced voltage?

• It decreases the voltage

• It has no effect on the voltage

• It increases the voltage

• It reverses the voltage

Which of the following best describes the function of a generator?

• Converts electrical energy to mechanical energy

• Converts mechanical energy to electrical energy

• Stores electrical energy

• Distributes electrical energy

Explain how Lenz's Law is applied in the operation of a generator.

• It determines the direction of the induced current

• It increases the efficiency of the generator

• It reduces the resistance in the circuit

• It controls the speed of the generator

A motor converts electrical energy into which type of energy?

• Thermal energy

• Chemical energy

• Mechanical energy

• Nuclear energy

Describe the effect of a magnetic field on a current-carrying conductor.

• It has no effect

• It induces a voltage

• It exerts a force on the conductor

• It increases the resistance

Calculate the induced electromotive force (emf) in a coil with 50 turns, if the magnetic flux changes by 0.1 Wb in 2 seconds.

• 2.5 V

• 5 V

• 10 V

• 25 V

Which of the following is an application of Faraday's Law?

• Electric heater

• Transformer

• Light bulb

• Battery