# Magnetism and electromagnetism

• a1densmom
In summary, when a metal ring is placed in a rapidly alternating magnetic field, it can become hot to the touch due to the creation of electric fields caused by the changing magnetic field. The induction of an emf in the ring also contributes to the heating.

#### a1densmom

If you place a metal ring in a region in where a magnetic field is rapidly alternating, the ring may become hot to your touch. Why?

Is it because a changing magnetic field can create electric fields? I AM SO CONFUSED...and it seems so simple?!?

Well, I wouldn't call it simple.
You have a few more steps to explain why it gets hot.
Any other remarks?

can you give me a hint?

What does deflecting mean?

Last edited:
a1densmom said:
What does deflecing mean?
I don't know, why?
Hint: what will an electric field do inside of the conductor?

I thought that it might have something to do with it... I was lost.

Is it because the voltage is increased? I don't know... I am trying. Thank you for helping me.

A changing magnetic flux, here you can think of it as just a changing magnetic field, induces an emf in the ring. What will happen in the ring with this induced emf acting?
(Faraday's/Lenz's law is a bit confusing) ; )

Okay... I got it, I think... Thank you so much. Sorry if I annoyed you.

## 1. What is magnetism?

Magnetism is a natural force that causes objects, such as iron, to attract or repel one another. It is caused by the movement of electrons within a material.

## 2. What is an electromagnet?

An electromagnet is a temporary magnet that is created when an electric current passes through a wire wrapped around a magnetic material, such as iron. The strength of the electromagnet can be controlled by changing the amount of current flowing through the wire.

## 3. How does an electric current create a magnetic field?

When an electric current flows through a wire, it creates a magnetic field around the wire. The direction of the magnetic field depends on the direction of the current flow.

## 4. What is the difference between a permanent magnet and an electromagnet?

A permanent magnet is a material that produces a magnetic field without the need for an external source, while an electromagnet requires an electric current to produce a magnetic field. Additionally, the strength of a permanent magnet cannot be easily changed, whereas an electromagnet's strength can be controlled by adjusting the current flow.

## 5. How is magnetism used in everyday life?

Magnetism is used in a variety of everyday objects and technologies, such as speakers, motors, and generators. It is also used in magnetic compasses for navigation, MRI machines in healthcare, and credit/debit cards for data storage.