Question 1: Which of the following materials is not magnetic?

Answer: Plastic

Question 2: True or False: Magnetism can act through a vacuum.

Answer: True

Question 3: True or False: Opposite poles of two magnets repel each other.

Answer: False

Question 4: Define 'magnetic field'.

Answer: A region around a magnetic material or a moving electric charge within which the force of magnetism acts.

Question 5: Describe the process of magnetizing a steel rod using a permanent magnet.

Answer: Stroke the steel rod with one pole of a permanent magnet several times in the same direction.

Question 6: Explain why the Earth acts like a giant magnet.

Answer: The Earth's core is made up of molten iron and nickel, which flows and creates a magnetic field around the Earth.

Question 7: Calculate the force between two magnetic poles using the formula F = (μ * m1 * m2) / (4π * r^2). Given μ = 4π × 10^-7 T*m/A, m1 = 0.2 A*m, m2 = 0.3 A*m, and r = 0.05 m.

Answer: 0.00015 N

Question 8: Match the following terms to their definitions:

Answer: See full answer key

Question 9: Order the steps in creating an electromagnet.

Answer: See full answer key

Question 10: Fill in the blank: A ________ is a material that does not allow magnetic flux to pass through it.

Answer: diamagnetic

Question 11: Discuss the impact of Earth's magnetic field on modern technology.

Answer: Earth's magnetic field plays a crucial role in navigation systems, such as compasses, which rely on the Earth's magnetic poles. It also protects satellites and other electronic systems from solar winds. However, variations in the magnetic field can affect telecommunications and GPS accuracy.