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## Main Question or Discussion Point

could someone please explain in simple terms what ampere-turns and ampere turns per meter means?

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could someone please explain in simple terms what ampere-turns and ampere turns per meter means?

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Electromagnetism:could someone please explain in simple terms what ampere-turns and ampere turns per meter means?

It has been found that an electric current sets up a magnetic field

similar to that produced by a permanent magnet. This action is known as

Electromagnetism and is very important in many devices. A desirable

feature of electromagnetism is that it is possible to control the strength

and polarity of the magnetic field. When current exists in a coil, the coil

has all the magnetic qualities of a permanent magnet and is called an

Electromagnet. If this electromagnet is brought near a permanent

magnet or another electromagnet, the like and unlike poles react exactly

as explained for the permanent magnets. Moreover, an increase of current

in the coil increases the strength of the magnetic field, and a decrease

of current weakens the field.

Ampere-Turns:

When the number of loops or turns of the coil is increased and the

current remains the same, the strength of the magnetic field increases.

Each loop or turn of the coil sets up it's own magnetic field, which unites

with the fields of the other loops to produce the field around the entire

coil. The more loops, the more magnetic fields unite and reinforce each other

and, as a result, the total magnetic field becomes stronger.

To compare the magnetic strength of different coils, and to obtain

a basis for measuring the magnetomotive force of an electromagnet, the number

of turns of wire is multiplied by the number of amperes of current carried

by the wire and the result is called Ampere-Turns (NI). The ampere-turn

is the unit for measuring the magnetomotive force of a current-carrying

coil. In a formula, the magnetomotive force in ampere-turns can be expressed

as:

F = NI

F = magnetomotive force in ampere-turns

N = number of turns

I = current in amperes

For example:

A coil with 10 turns and a current of 10 amperes has an F of 100

ampere-turns.

The above excerpted from: h

Ampere-turns per meter is just as it reads, the number of ampere turns per length of the electromagnetic coil.

Chris

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thanks chris, that explained it very clearly

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