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| Q. |
Permanent magnets are made of high carbon steel and |
| A. | 15% of cobalt |
| B. | 20% of cobalt |
| C. | 35% of cobalt |
| D. | 45% of cobalt |
| Answer» D. 45% of cobalt | |
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chetan chandragiriwar
2 weeks ago
- (b) 20% of cobalt
- Explanation: Cobalt increases magnetic retention and hardness. Alloys like Alnico (Aluminum, Nickel, and Cobalt) are typical for permanent magnets.
- Explanation: Cobalt increases magnetic retention and hardness. Alloys like Alnico (Aluminum, Nickel, and Cobalt) are typical for permanent magnets.
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