A magnet can be magnetized :

Options

A. By keeping it with the in contact gold
B. By keeping it with the contact in iron
C. by heating it
D. By rubbing it with another magnet

Explanation

To answer the question "A magnet can be magnetized," we need to explore the methods through which magnetization occurs. Here’s a step-by-step solution:

### Step 1: Understanding Magnetization
Magnetization is the process of making a material magnetic. This can be achieved through various methods.

### Step 2: Rubbing with Another Magnet
One common method to magnetize a magnet is by rubbing it with another magnet. When you rub a magnet along the length of another magnet in one direction, the magnetic domains in the magnet being rubbed align in the same direction, thus magnetizing it.

### Step 3: Contact with Ferromagnetic Materials
Another way to magnetize a magnet is by placing it in contact with ferromagnetic materials like iron. When a magnet is placed in contact with iron, the iron can become magnetized due to the alignment of its magnetic domains.

### Step 4: Heating the Magnet
Heating a magnet generally does not magnetize it; instead, it can demagnetize it. High temperatures can disrupt the alignment of magnetic domains, leading to a loss of magnetism.

### Conclusion
Based on the above steps, the correct methods to magnetize a magnet include rubbing it with another magnet and placing it in contact with ferromagnetic materials like iron. Heating the magnet does not help in magnetization.

### Final Answer
A magnet can be magnetized by:
1. Rubbing it with another magnet.
2. Placing it in contact with ferromagnetic materials like iron.