Unlike paramagenetic substance, ferromagnetic substances show ………. even if the external magnetic field is removed.

Answer

### Step-by-Step Solution:

1. **Understanding the Terms**:
- **Paramagnetic Substances**: These materials are weakly attracted by a magnetic field and do not retain significant magnetization once the external field is removed.
- **Ferromagnetic Substances**: These materials are strongly attracted by a magnetic field and can retain their magnetization even after the external magnetic field is removed.

2. **Key Difference**:
- The main difference between paramagnetic and ferromagnetic substances lies in their ability to retain magnetization.
- While paramagnetic substances lose their magnetization immediately after the external magnetic field is removed, ferromagnetic substances can maintain a level of magnetization.

3. **Conclusion**:
- Therefore, the statement in the question can be completed as follows: "Unlike paramagnetic substances, ferromagnetic substances show **permanent magnetism** even if the external magnetic field is removed."

4. **Examples**:
- Common examples of ferromagnetic substances include iron, cobalt, and nickel, which are often used to create permanent magnets due to their ability to retain magnetization.

### Final Answer:
Unlike paramagnetic substances, ferromagnetic substances show **permanent magnetism** even if the external magnetic field is removed.

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