| Bar magnet | Solenoid |
| The magnetism is permanent | The magnetism is temporary |
| 1. The magnetism is permanent | 1. The magnetism is temporary |
| 2. Permanent magnet | 2. Electromagnet It act as a magnet when current passed through it. |
| 3. Weak magnetic field | 3. Strong magnetic field |
| 4. Strength cannot be changed. | 4. Strength can be changed by changing the current through it or changed the number of turns. |
| 5. Polarity is fixed and cannot be easily reversed. | 5. The polarity can be reversed by changing the direction of current through it |