Rare Earth Magnets Questions

Rare earth magnets are the strongest type of permanent magnet commercially available. Rare earth magnet types include neodymium and samarium-cobalt. Rare earth magnets are an essential component in many electronic devices such as cell phones, computers, speakers, hard drives and wind turbines.
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Important Rare Earth Magnets Questions with Answers

1. Choose the correct answer: Rare earth magnets are ______

1. Temporary magnets
2. Permanent magnets

Answer: b) Permanent magnets Explanation: Rare earth magnets are permanent magnets composed of rare earth elements.
2. Branch of physics that deals with the study of interactions between electrically charged particles is known as _______

1. Thermodynamics
2. Mechanics
3. Electromagnetism
4. Dynamics

Answer: c) Electromagnetism Explanation: Electromagnetism deals with electromagnetic forces and interactions between electrically charged particles.
3. Choose the correct answer: Which among the following has a higher resistance to oxidation?

1. Samarium-cobalt
2. Neodymium

Answer: a) Samarium-cobalt Explanation: Comparatively, samarium-cobalt has a higher resistance to oxidation.
4. The refrigerator magnet is a _____

1. Temporary magnets
2. Permanent magnets

Answer: b) Permanent magnets Explanation: Permanent magnets are used in refrigerators since they do not lose their magnetic property when the external magnetic field is removed.
5. State true or false: Permanent magnets do not retain magnetic property in the absence of an external magnetic field.

1. TRUE
2. FALSE

Answer: b) FALSE Explanation: Permanent magnets retain magnetic property even in the absence of an external magnetic field.
6. Rare-earth magnets are used in ______

1. Bicycle dynamos
2. Wind turbine generators
3. Computer hard disk drives
4. All the above options

Answer: d) All the above options Explanation: Rare-earth magnets are used in all of the above options.
7. What is the magnetic field strength of ceramic magnets?

1. 0.5
2. 1.5
3. 2.5
4. 3.5

Answer: d) 3.5 Explanation: The magnetic field strength of ceramic magnets is 3.5.
8. Choose the correct answer: _______ are obtained from strontium and barium ferrite.

1. Rare earth magnets
2. Ceramic magnets

Answer: b) Ceramic magnets Explanation: Ceramic magnets are obtained from barium ferrite and strontium. 9. Which is the strongest magnet in the world.

Neodymium is the strongest magnet in the world.

10. Choose YES or NO: Rare earth magnets are vulnerable to corrosion.

1. YES
2. NO

Answer: a) YES Explanation: Rare Earth magnets are brittle and undergo corrosion very easily.

Watch the video below to know more about magnetism.

Practice Questions

1. What are magnets
2. What are the types of magnets? Explain each with an example.
3. What are the advantages of rare earth magnets?
4. What are the disadvantages of rare earth magnets?
5. List five uses of neodymium magnets.