PHYSICS - Magnetism - Current and Magnetic Fields

The video explains electromagnets, which can be turned on and off, and their various applications, such as in scrapyards and maglev trains. It describes how a current in a wire creates a magnetic field, which can be enhanced by coiling the wire around a magnetic core, forming a solenoid. The strength of an electromagnet can be increased by adding more coils or increasing the current. An experiment is suggested to observe how the number of coils and current affect the electromagnet's ability to pick up paperclips. The video concludes by highlighting the usefulness and controllability of electromagnets.

Explain how increasing the number of coils affects the strength of an electromagnet.

What relationship exists between the current and the strength of the electromagnet?