- #1

noname12345

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Hopefully, a simple question with a simple answer.

I have a flat magnet (assume infinite long and wide) with a field strength at the surface of (for simplicity) exactly 1Tesla.

What will the field strength be (in air) 1mm away from that surface?

I know approximates to 1/r^3, but 1/0.001^3 = 1e9.

The field strength will reduce, so ?divide? 1T / 1e-9; obviously not! It reduces, but not that fast.

So, what then? A formula and worked example would be very helpful.

Thanks, Buk.

Update: I found this formula: B = µ

d= distance in meters; µ

Is that a universal constant (like µ

I have a flat magnet (assume infinite long and wide) with a field strength at the surface of (for simplicity) exactly 1Tesla.

What will the field strength be (in air) 1mm away from that surface?

I know approximates to 1/r^3, but 1/0.001^3 = 1e9.

The field strength will reduce, so ?divide? 1T / 1e-9; obviously not! It reduces, but not that fast.

So, what then? A formula and worked example would be very helpful.

Thanks, Buk.

Update: I found this formula: B = µ

_{0}/ 4π * 2µ / d^{3}d= distance in meters; µ

_{0}= 4πe-7; and µ is defined as "the magnetic moment"; but no further explanation.Is that a universal constant (like µ

_{0}) I can look up; or a constant to do with ?
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