Find the odd one out from the following and give reason for your choice.
Magnetite, bar magnet, dumb bell-shaped magnet, horse-shoe magnet

Explanation

To solve the question of finding the odd one out from the list: Magnetite, bar magnet, dumbbell-shaped magnet, and horse-shoe magnet, we can follow these steps:

### Step 1: Identify the types of magnets
- **Magnetite**: This is a naturally occurring mineral that has magnetic properties. It is classified as a natural magnet.
- **Bar magnet**: This is a type of artificial magnet that is shaped like a rectangular bar and is commonly used in various applications.
- **Dumbbell-shaped magnet**: This is also an artificial magnet, designed in a specific shape for practical uses.
- **Horse-shoe magnet**: This is another type of artificial magnet, shaped like a horse shoe, which is used to create a strong magnetic field.

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