Chapter 8: Magnetism

2. Fatima is studying magnetic shielding. She knows that magnetic shielding is used to protect sensitive instruments from magnetic fields. What material is commonly used for magnetic shielding?

3. Diamagnetic materials are:

4. Unlike magnetic poles will:

5. The closeness of magnetic field lines indicates:

6. George is studying induced magnetism. He knows that a magnetic material can be magnetized by stroking it with a magnet. What is the method of magnetizing a steel bar by repeatedly stroking it called?

7. Chloe is studying paramagnetic materials. She knows that paramagnetic materials are weakly attracted to magnets. What happens to the attraction when the external magnetic field is removed?

8. Tina is studying the stroking method of inducing magnetism. She knows that stroking a steel bar with a magnet can magnetize it. What is the direction of stroking?

9. Emma is studying the Earth's magnetic field. She knows that the Earth's magnetic field is generated by the motion of liquid iron in the Earth's core. What is the outer part of the Earth's core called?

10. Magnetic field lines never:

11. The region around a magnet where magnetic force is felt is called:

12. Which material is commonly used for magnetic shielding?

13. Magnetic field lines always emerge from:

14. Quinn is studying ferromagnetic materials. He knows that ferromagnetic materials are strongly attracted to magnets. Which of the following is a ferromagnetic material?

15. Ahmed is studying magnetism and learns that a magnet has two poles. He brings the north pole of one magnet near the north pole of another magnet. What happens to the two magnets?

16. Bilal is studying the domain theory of magnetism. He learns that each domain behaves like a tiny magnet. In an unmagnetized piece of iron, the domains are arranged randomly. What happens to the domains when the iron is magnetized?

17. Ibrahim is studying the heating method of inducing magnetism. He knows that heating a magnet above a certain temperature can demagnetize it. What is this temperature called?

18. The Earth behaves like:

19. Xia is studying magnetic shielding. She knows that magnetic shielding is used to protect sensitive equipment. What material is placed around equipment to shield it from magnetic fields?

20. Which of the following is diamagnetic?

21. Oliver is studying the difference between magnetic and non-magnetic materials. He knows that magnetic materials contain unpaired electrons. What is the basis of magnetism in materials?

22. Ibrahim is studying the solenoid method of inducing magnetism. He knows that a solenoid can be used to make an electromagnet. What happens when the current in the solenoid is turned off?

23. Julia is studying temporary magnets. She knows that temporary magnets are used in relays. What is the function of a relay?

24. Which material is suitable for making electromagnets?

25. Zara is studying temporary magnets. She knows that temporary magnets are used in electric motors. What is the advantage of using temporary magnets in motors?

26. Waseem is studying the force between magnetic poles. He knows that like poles repel and unlike poles attract. What happens when the north pole of one magnet is brought near the south pole of another?

27. Sam is studying magnetic shielding. She knows that magnetic shielding is used to protect sensitive equipment in devices like MRI machines. What is the purpose of magnetic shielding in an MRI?

28. David is studying the direction of the magnetic field at a point. He knows that the direction of the magnetic field is the direction a north pole would move. Outside a bar magnet, what is the direction of the magnetic field lines?

29. Magnetism produced in an unmagnetized material is called:

30. The magnetic field inside a magnet is directed from: