Anyone able to calculate flux density?

Something Else · 10 Mar 2013 at 21:24

I'm trying to work out the flux density of an electromagnet and I'm stuck.

The question is as follows

"An electromagnet has a cross section as shown (see below). If the flux produced by the electromagnet is 2mwb calculate the flux density in the cross section

as you can see ive got as far as working out the area. its all in millimeters and its 10x10mm,
I don't expect anyone to give me the answer on a plate but if anyone can show me the steps to work it out then id be very grateful.

Something Else · 10 Mar 2013 at 21:29

Smigly said:
say what now.

thats how i currently feel.

Something Else · 10 Mar 2013 at 21:46

I have gotten this far working it out.

magnetic flux density is measured in tesla's

Φ= magnetic flux passing through a certain area and measured in webers
B= The magnetic flux density in tesla
A= The area, at right angles to the flux through which the magnetic flux passes

so i want B so the formula is

Φ÷A

so this should be 2÷100

now im confused again as i think i need to factor in that 100mm is area so its sqaured

also i think that the rounded corners will affect the flux density or is that just the flux pattern they have an effect on?

cheers for the help

and yea its sort of homework but not school. City and Guilds electrical qualification

Something Else · 10 Mar 2013 at 21:48

Salsa said:
B = Φ /Area

Where:

B is Magnetic flux density
Φ is magnetic flux

/Salsa

Edit:
B = 2×10-3 × 257x10-6 = 7.78 kg s-2 A-1

This might help

Awesome man cheers!

Something Else · 10 Mar 2013 at 21:51

thats where i fell down i think. because everything was in milli i assumed that maybe i didnt need to use it but i think i was wrong. thank you