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- Thread starter copresh1
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- #2

berkeman

Mentor

- 60,564

- 10,884

- #3

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where B is flux density,L is lenght of conductor, and I is the current in the conductor.

magnetic field density=magnetic flux/c/s area

magnetic flux=mmf/reluctance

& reluctance=lenght of airgap/mew0 * c/s A

- #4

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next i used S=L/mew0*crosssectional area of air gap(L=10mm,c/sarea airgap=piD=3.14*0.001)

=2533029.59A/wb

next using H=IN/L(I=100mA,N=50,L=15mm this assumed)

=333.33A/m

but when i go to find relative permeabilty i am getting a huge value which i think is wrong.

apart from that my understanding is that i there are three elements involved here ie the coil,the magnet,the airgap(am i right?)but how do i find the mmf of the magnet bcoz i cannot find the reluctance of the magnet

- #5

berkeman

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- #6

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the value i get for relative permeability is 238734.802

i will scan and attach the method that i have followed to solve the prob till now.

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