Question

We can make very strong magnets by

• A. The single touch method.
• B. Divided touch method.
• C. Using electric currents.
• D. Using two or three magnets.

Answer 1

The correct option is C

Using electric currents.

We can make very strong magnets using an electric current known as an electromagnet.

Factors influencing the strength of an electromagnet:

1. The properties of the core, the strength of the current passing through the
   core.
2. The number of turns of the core, the shape and size of the core.
3. The strength of an electromagnet is the number of turns of the conductor around the core that can be increased by increasing the current or voltage.

Hence option C is correct.