Recap EMC 1-2

What are the two poles of a magnet called?

• Positive and Negative

• North and South

• Up and Down

• Left and Right

Why does an iron nail become a temporary magnet when placed near a strong magnet?

• It gains extra electrons

• Its domains align with the magnetic field

• It gets electrically charged

• It melts slightly

What are the two poles of a magnet called?

• a) Positive and Negative
• b) North and South

• c) Up and Down
• d) Left and Right

Answer explanation

Jupiter is a gas giant made primarily of hydrogen and helium. Unlike terrestrial planets that have solid surfaces, gas giants like Jupiter don't have a well-defined solid surface, allowing them to accumulate more mass in a gaseous form. This composition has allowed Jupiter to grow significantly larger than planets with solid surfaces.

Which of these is a natural magnet?

• a) Refrigerator magnet
• b) Earth

• c) Steel paperclip
• d) Electromagnet

What happens when two like poles of magnets face each other?

• a) They attract
• b) They repel

• c) They stick together
• d) Nothing happens

What is the unit of magnetic flux?

• a) Tesla
• b) Ohm
• c) Weber

• d) Ampere

Which rule helps determine the direction of the magnetic field around a current-carrying wire?

• a) Left Hand Rule
• b) Right Hand Grip Rule

• c) Fleming’s Right Hand Rule
• d) Ohm’s Law

Why does an iron nail become a temporary magnet when placed near a strong magnet?

• a) It gains extra electrons
• b) Its domains align with the magnetic field

• c) It gets electrically charged
• d) It melts slightly

If current in a wire flows toward you, what is the direction of its magnetic field?

• a) Clockwise
• b) Counter-clockwise

• c) Straight up
• d) Random

What happens to the force between two parallel wires if their currents flow in opposite directions?

• a) They attract
• b) They repel

• c) No force acts
• d) They explode