What is an electromagnet? State two ways by which the strength of an electromagnet can be increased

Explanation

### Step-by-Step Solution:

1. **Definition of Electromagnet**:
An electromagnet is a type of magnet that is created when an electric current flows through a coil of wire, typically wound around a core made of soft iron. While the current is flowing, the coil generates a magnetic field, making the iron core magnetized. This magnetism is temporary, meaning that when the current is turned off, the magnetic field disappears, and the core loses its magnetism.

2. **Ways to Increase the Strength of an Electromagnet**:
- **Increase the Current**: One way to increase the strength of an electromagnet is to increase the amount of electric current flowing through the coil. A higher current results in a stronger magnetic field.
- **Increase the Number of Turns of Wire**: Another way to enhance the strength of the electromagnet is to increase the number of turns of the insulated copper wire in the coil. More turns mean that the magnetic field produced by each loop of wire adds together, resulting in a stronger overall magnetic field.
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