- #1

- 864

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But what about at a point over a closed loop that wasn't the centre? Is there a simple calculation for that?

Thanks

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- #1

- 864

- 17

But what about at a point over a closed loop that wasn't the centre? Is there a simple calculation for that?

Thanks

- #2

- #3

- 864

- 17

I'll have a better look later, in which case if I'm wrong I'll remove this post.

Cheers

- #4

Baluncore

Science Advisor

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The plot drawn across the graph is the field that is seen travelling along a line that passes through the axis, parallel to, but slightly away from the plane of the loop. The plot is normalised so that +Bo is the axial field value.

The steepness of the transition while crossing the wire is determined by the offset from the plane of the coil. Let me know if you find an analytic solution.

- #5

- 864

- 17

So there is a wire loop of current on the ground, I'm walking above it from -2 to +2, passing through the center of the axis of symmetry. I don't see how the yellow graph can be B? All I can picture is current traveling, say, anti-clockwise, then I would have through if the yellow graph was B, that as I approach it and am at -1 it peaks and all the B is coming from the LHS then as I am at the middle, the only component is from the center and there is some cancellation diagonally, then as I leave a gain at 1 it peaks with just RHS magnetic field. So why would it go negative as I first approach it, and leave why would it have a negative gradient? I would have thought it would taper up as I approach, peak, taper down (due to cancellation), taper up, peak, taper down.

Thanks heaps!

- #6

- 864

- 17

So I thought it would look like this:

- #7

Baluncore

Science Advisor

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The vertical field inside the loop is opposite that outside the loop.

Over the wire the B field is horizontal so it has no vertical component.

- #8

- 864

- 17

Would you sum the components, dot product, or cross product?

Cheers

- #9

Baluncore

Science Advisor

- 8,907

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- #10

- 864

- 17

Ah of course,

Thank you very much

Thank you very much

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