# Force on a coil

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#1
How would you work out the force on a coil of wire if you know:

The value of the B field going through it

Number of turns

Diameter

Current going through it

Equations I have on my sheet are:
F=BIL
F=BQV
Flux= BA

(then the EMF and transformer ones)

Thanks
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#2
Anyone?
0
7 years ago
#3
I think the reason no one has replied is that the question needs more information.
What sort of coil are we talking about? Context.
What shape is it? The implication is circular.
How is it positioned in the field? Angle?
Don't you mean "torque" or "couple", not force?

Do you have the formula
C = BIANSinθ on your sheet?
0
7 years ago
#4
(Original post by Davelittle)
Anyone?
I thought it was do with a female coil.

Posted from TSR Mobile
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#5
(Original post by Stonebridge)
I think the reason no one has replied is that the question needs more information.
What sort of coil are we talking about? Context.
What shape is it? The implication is circular.
How is it positioned in the field? Angle?
Don't you mean "torque" or "couple", not force?

Do you have the formula
C = BIANSinθ on your sheet?
I'll try and describe it:

It's a speaker than consists of an electromagnet inside of a cylindrical permanent magnet. The South Pole of the permanent magnet is at the front of the page and the whole thing goes into the page meaning the North Pole is further back into the page. The electromagnet is circular on the diagram and is just inside the permanent magnet. (From what I can deduce)

And no I've never seen that formulae before (although its not a course specific revision guide)
0
7 years ago
#6
(Original post by Davelittle)
I'll try and describe it:

It's a speaker than consists of an electromagnet inside of a cylindrical permanent magnet. The South Pole of the permanent magnet is at the front of the page and the whole thing goes into the page meaning the North Pole is further back into the page. The electromagnet is circular on the diagram and is just inside the permanent magnet. (From what I can deduce)

And no I've never seen that formulae before (although its not a course specific revision guide)
Without the diagram it's a bit of guesswork, unfortunately.
I'm guessing that you have a circular coil and they want you to use the idea that the circumference of the coil is the length of coil in the field. This would be multiplied by the number of turns N to give the total length of wire L in the field in the formula F = BIL
So L = N x circumference.

But without the diagram and the actual complete question I'm only guessing, sorry.
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