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| Q.109 | लोहा, कोबाल्ट, निकल, गिडोलिनियम क्या हैं? | |
| Ans | 1. विद्युत-स्थैतिक (Electrostatic substances | |
| 2. अनुचुंबकीय पदार्थ (Paramagnetic substances) | ||
| 3. मृदु लौहचुंबकीय पदार्थ (Soft ferromagnetic substances) | ||
| 4. कठोर लौहचुंबकीय पदार्थ (Hard ferromagnetic substances) |
Correct Ans Provided: 3
