# magnetic motive force

Discussion in 'Physics' started by polarbear99, Dec 30, 2016.

## Hi all, i'm currently studying "Magnetic Motive Force" or MMF for short and i'm having trouble with

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1. ### polarbear99 Thread Starter New Member

Nov 29, 2016
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Hi all,
i'm currently studying "Magnetic Motive Force" or MMF for short and i'm having trouble with this question??

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2. ### Kermit2 AAC Fanatic!

Feb 5, 2010
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The magnetic flux value divided by the cross sectional area of the magnetic flux path gives the flux DENSITY (B)

The amps times the number of turns in the solenoid divided by the LENGTH of the magnetic flux path is the field STRENGTH (H)

a TESLA is 1 weber per meter (sq)

3. ### polarbear99 Thread Starter New Member

Nov 29, 2016
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Hi Kermit2, thanks for the speedy response!

So am i right in thinking that Magnetic Flux Value 0.5T divided by 6mm (yoke width) = 0.08333 (B) Flux Density.

0.75 (H A-t/m) X 100 turns divided by Length (Flux Path) 17.5mm = 4.28571t (mmf)
0.75 (H A-t/m) X 100 turns divided by Length (Flux Path) 19mm = 3.94736t (mmf)