# Magnet through a copper coil - What if poles rotated 90 degress

• jtotheroc
In summary, the concept behind a magnet passing through a copper coil is based on the principles of electromagnetism, where the changing magnetic field created by the moving magnet induces an electric current in the coil. The direction of the magnet's poles matters as it determines the direction of the induced current, which can change if the poles are rotated. However, the rotation of the poles does not affect the strength of the current, which is determined by the strength of the magnetic field and the speed of the magnet. This phenomenon has practical applications in generating electricity, powering devices, and non-destructive testing.
jtotheroc
I was wondering what voltage or current, if any, would be produced if the basic magnet through a copper coil experiment had the poles rotated 90 degress so north and south faced the top/bottom of the coil rather than the entry/exit points?

The attached image has a basic illustration of this.

Thanks

In the limit of a perfect coil, there should be no induction due to the symmetry of the problem. A real coil is not perfect (and the same is true for the magnet and its motion), so you will get some induction, but not much.

1.

## What is the concept behind a magnet passing through a copper coil?

The concept behind a magnet passing through a copper coil is based on the principles of electromagnetism. As the magnet moves through the coil, it creates a changing magnetic field, which induces an electric current in the coil. This phenomenon is known as electromagnetic induction.

2.

## Why does the direction of the magnet's poles matter when passing through a copper coil?

The direction of the magnet's poles matters because it determines the direction of the induced current in the coil. If the poles are aligned with the coil, the induced current will flow in one direction, whereas if the poles are rotated 90 degrees, the current will flow in the opposite direction.

3.

## What happens to the induced current when the magnet's poles are rotated 90 degrees?

When the magnet's poles are rotated 90 degrees, the direction of the induced current in the copper coil will also change. This is because the changing magnetic field created by the rotating poles will induce a current in the opposite direction in the coil.

4.

## How does the rotation of the poles affect the strength of the induced current?

The rotation of the poles does not affect the strength of the induced current in the copper coil. The strength of the current is determined by the strength of the magnetic field and the speed at which the magnet passes through the coil.

5.

## What are the practical applications of a magnet passing through a copper coil?

This phenomenon has many practical applications, such as generating electricity in generators and power plants, as well as in everyday devices such as electric motors and transformers. It is also used in non-destructive testing to detect cracks or flaws in metal objects.

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