PASSAGE-II : The magnetic field of a magnet is an invisible field which is created by magnetism. Magnets are made by using electrical and mechanical methods. A temporary magnet can be made by passing electricity through a coil.
Which of the following shows a temporary magnetism?

Options

A. Bar magnet
B. Horse-shoe magnet
C. Electromagnet
D. Earth

Explanation

To determine which of the given options shows temporary magnetism, we can analyze each option step by step:

1. **Understanding the Concept of Temporary Magnetism**:
- Temporary magnets are materials that can become magnetized when exposed to a magnetic field or electric current but lose their magnetism once the field or current is removed.

2. **Analyzing the Options**:
- **Option 1: Bar Magnet**:
- A bar magnet has a permanent magnetic field with a north and south pole. It retains its magnetism even when not in an external magnetic field. Therefore, it is not a temporary magnet.
- **Option 2: Horseshoe Magnet**:
- Similar to the bar magnet, a horseshoe magnet is also a permanent magnet. It has a fixed magnetic field and retains its magnetism without the need for an external influence. Thus, it is not a temporary magnet.
- **Option 3: Electromagnet**:
- An electromagnet is created by wrapping a wire around a core (usually iron) and passing an electric current through it. The magnetic field is produced only when the current flows, and it disappears when the current stops. Therefore, it is a temporary magnet.
- **Option 4: Earth**:
- The Earth behaves like a giant magnet with a permanent magnetic field. It has a magnetic north and south pole and retains its magnetism continuously. Thus, it is not a temporary magnet.

3. **Conclusion**:
- Based on the analysis, the option that shows temporary magnetism is **Electromagnet**.

### Final Answer:
**Electromagnet** shows temporary magnetism.