# Magnetic fields due to currents

• alex36
In summary, a magnetic field is a region in space where magnetic forces can be observed, created by moving electric charges. They can be produced by currents through electromagnetism and can be shielded using materials such as iron or steel. The right-hand rule is used to determine the direction of a magnetic field, and these fields can cause objects with electric charges to experience a force known as the Lorentz force, resulting in circular or parallel motion around the wire.

#### alex36

My syllabus has point
*' 'describe and compare the forces on mass, charge and current in gravitational, electric and magnetic fields, as appropriate"

what does this mean ?

Compare the intrinisic strengths of these forces. You'll see which is strong and weak.

## 1. What is a magnetic field?

A magnetic field is a region in space where magnetic forces can be observed. It is created by moving electric charges and can be either a permanent or temporary force.

## 2. How are magnetic fields produced by currents?

Magnetic fields are produced by currents through a process called electromagnetism. When an electric current flows through a wire, it creates a circular magnetic field around the wire.

## 3. Can magnetic fields be shielded?

Yes, magnetic fields can be shielded by using materials such as iron or steel which are highly permeable to magnetic fields. These materials can redirect and absorb the magnetic field lines, reducing its strength.

## 4. What is the right-hand rule for determining the direction of a magnetic field?

The right-hand rule is a method used to determine the direction of a magnetic field. If you point your right thumb in the direction of the current, then the curled fingers will indicate the direction of the magnetic field.

## 5. How do magnetic fields due to currents affect the movement of objects?

Magnetic fields due to currents can cause objects with electric charges to experience a force. This force is known as the Lorentz force and can cause an object to move in a circular motion around the wire or in a straight line parallel to the wire.