# Moving a bar magnet through a coil

• Jimmy25
In summary, the graph of flux through a loop as a function of time while moving a bar magnet at a constant speed should resemble a normal curve with a plateau when the magnet enters and exits the loop. The graph of induced current in the loop will also have a similar shape, with a plateau when the bar of the magnet is inside the loop and a negative slope representing the induced current.
Jimmy25

## Homework Statement

You move a bar magnet through a coil at a constant speed. Graph the flux through the loop as a function of time. Graph the induced current in the loop as a function of time.

## The Attempt at a Solution

Graph of flux vs time:

I'm thinking is should look like a normal curve but once part of the magnet enters the loop will it be constant until the other end of the magnet exits the coil?

Graph of induced current vs time:

Same as flux vs time?

Flux out the North end of the magnet is the same as flux into the South end.
.. so, there should be a fairly long "plateau" on the top of the "normal" curve.

but the Current is induced by the NEGative CHANGE of flux ( neg. slope)

So there will be a flat plateau where "bar" of the magnet is inside the loop?

## 1. How does moving a bar magnet through a coil produce electricity?

When a bar magnet is moved through a coil, it creates a changing magnetic field. This changing magnetic field induces an electric current in the coil, according to Faraday's Law of Induction. This current can then be used to power electrical devices.

## 2. What factors affect the amount of electricity produced when moving a magnet through a coil?

The amount of electricity produced depends on the strength of the magnetic field, the speed at which the magnet is moved, and the number of turns in the coil. Increasing any of these factors will result in a higher induced current.

## 3. Can any type of magnet be used to produce electricity by moving it through a coil?

Yes, any type of magnet can be used as long as it has a magnetic field. However, stronger magnets will produce a greater amount of electricity.

## 4. What is the difference between moving a magnet through a coil and rotating a coil in a magnetic field?

Moving a magnet through a coil produces electricity through the induction of a changing magnetic field. In contrast, rotating a coil in a magnetic field produces electricity through the principle of electromagnetic induction, where a changing magnetic field is created by the coil itself.

## 5. Can moving a magnet through a coil produce an infinite amount of electricity?

No, moving a magnet through a coil can only produce a finite amount of electricity. The induced current will eventually decrease and stop as the magnet reaches equilibrium with the coil's magnetic field.

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