# How do you know if there is a magnetic field?

## How do you know if there is a magnetic field?

When you bring a compass near an item suspected of being magnetized or having a magnetic field, the compass will turn and point toward the appropriate pole of the object. A famous experiment showed that a wire with DC electric current running through it created a magnetic field.

How magnetic fields are created?

Magnetic fields are produced by moving electric charges. Everything is made up of atoms, and each atom has a nucleus made of neutrons and protons with electrons that orbit around the nucleus. Since the orbiting electrons ≠are tiny moving charges, a small magnetic field is created around each atom.

### How does Earth’s rotation affect magnetic field?

If you have a rotating electric current, it will create a magnetic field. On Earth, flowing of liquid metal in the outer core of the planet generates electric currents. The rotation of Earth on its axis causes these electric currents to form a magnetic field which extends around the planet.

How do you control a magnetic field?

“With the electrical control of magnetism, you use a capacitor in which one element is magnetic and, simply by charging the capacitor, you change the direction of the magnetism, say from being in the plane of the film to being perpendicular,” says Barnes.

## How can you show that the magnetic field produced by electric current?

Electric current produces a magnetic field. This magnetic field can be visualized as a pattern of circular field lines surrounding a wire. One way to explore the direction of a magnetic field is with a compass, as shown by a long straight current-carrying wire in. Hall probes can determine the magnitude of the field.

What is Dynamoeffect?

The dynamo effect is a geophysical theory that explains the origin of the Earth’s main magnetic field in terms of a self-exciting (or self-sustaining) dynamo. The electric current, in turn, produces a magnetic field that also interacts with the fluid motion to create a secondary magnetic field.

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### What can block magnetic fields?

Magnetic fields cannot be blocked, only redirected. The only materials that will redirect magnetic fields are materials that are ferromagnetic (attracted to magnets), such as iron, steel (which contains iron), cobalt, and nickel.