Magnetism MCQ Quiz - Multiple Choice Questions & Answers Page 2

11. Electromagnets are used in

1. loud speakers
2. door bells
3. both a and b
4. cabinet doors

12. Magnetic susceptibility para-magnetic materials is

1. +10 raised to -5
2. -10 raised to -5
3. 10 raised to 5
4. 10 raised to -5 to 10 raised to -2

13. Magnetic susceptibility dia--magnetic materials is

1. +10 raised to -5
2. -10 raised to -5
3. 10 raised to 5
4. 10 raised to -5 to 10 raised to -2

14. Magnetic susceptibility ferro-magnetic materials is

1. +10 raised to -5
2. -10 raised to -5
3. 10 raised to 5
4. 10 raised to -5 to 10 raised to -2

15. Typical size of magnetic domains ................(mm).

1. 10-1
2. 0.1-1
3. 0.05
4. 0.001

16. Typical thickness of Bloch walls ................(nm).

1. 0.1-1
2. 10-1
3. 10-50
4. 100

17. Example for soft magnet

1. 45 Permalloy
2. CrO2
3. Fe-Pd
4. Alnico

18. Example for hard magnet

1. 45 Permalloy
2. CrO2
3. Fe-Pd
4. Alnico

19. Example for magnetic material used in data storage devices

1. 45 Permalloy
2. CrO2
3. Cunife
4. Alnico