Electromagnetism for Grade 10

What is an electric field?

• A type of battery used to store electrical energy

• The path that electricity follows through a circuit

• A force field that surrounds electrically charged particles and exerts force on other charged particles within the field.

• A type of wire used to conduct electricity

Explain the concept of magnetic field.

• A magnetic field is a region around a magnetic material or a moving electric charge within which the force of magnetism acts.

• A magnetic field is a region around a sound wave within which the force of sound acts.

• A magnetic field is a region around a non-magnetic material within which the force of gravity acts.

• A magnetic field is a region around a static electric charge within which the force of electricity acts.

What is the unit of magnetic field strength?

• Newton (N)

• Tesla (T)

• Watt (W)

• Joule (J)

Describe electromagnetic induction.

• Generating an electromotive force (emf) or voltage across a conductor when it is exposed to a changing magnetic field.

• Causing a decrease in the resistance of a conductor

• Creating a static magnetic field around a conductor

• Producing a constant current in a conductor

State Faraday's law of electromagnetic induction.

• The induced EMF in a circuit is equal to the magnetic flux through the circuit.

• The induced electromotive force (EMF) in any closed circuit is equal to the rate of change of the magnetic flux through the circuit.

• The induced EMF in a circuit is inversely proportional to the rate of change of magnetic flux.

• The induced EMF in a circuit is directly proportional to the resistance of the circuit.

What is the electromagnetic spectrum?

• A type of metal used in construction

• Range of all types of electromagnetic radiation

• The different types of weather patterns

• The range of colors visible to the human eye

List the different types of waves in the electromagnetic spectrum.

• red waves, blue waves, green waves, yellow waves, orange waves, purple waves, and pink waves

• solid waves, liquid waves, gas waves, plasma waves, Bose-Einstein condensate waves, fermionic condensate waves, and quark-gluon plasma waves

• hot waves, cold waves, warm waves, freezing waves, boiling waves, scorching waves, and lukewarm waves

• radio waves, microwaves, infrared waves, visible light, ultraviolet waves, X-rays, and gamma rays

Explain the application of electromagnetism in a simple electric motor.

• To produce sound waves for the motor

• To generate heat energy for the motor

• The application of electromagnetism in a simple electric motor is to create a magnetic field that interacts with a permanent magnet to produce motion.

• To create a gravitational force for the motor

How is electromagnetism used in a transformer?

• Through mutual induction

• By emitting radio waves

• Through gravitational force

• By generating static electricity

Define the term 'electromagnetic radiation'.

• Sound waves produced by electrical devices

• Waves of the electromagnetic field carrying radiant energy

• The movement of electrically charged particles through a conductor

• A type of static electricity