ATAR Notes: Forum

VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Physics => Topic started by: NOnga on October 03, 2013, 01:05:15 pm

Title: quick question
Post by: NOnga on October 03, 2013, 01:05:15 pm: Is it true when flux is at maximum, the coil is moving parallel to the magnetic field?
Title: Re: quick question
Post by: lzxnl on October 03, 2013, 02:43:51 pm: Quote from: NOnga on October 03, 2013, 01:05:15 pm
Is it true when flux is at maximum, the coil is moving parallel to the magnetic field?

Magnetic flux is given by $BA\sin{\theta}$ where the angle is measured between the magnetic field line and the surface (not the surface normal here for simplicity).
This is a maximum when the two are perpendicular. AKA if the field is going north-south, you want your coil to be oriented east-west or up-down. If the coil is parallel to the magnetic field...how do you define parallel? If you mean the magnetic field is in the same plane as the coil...there will be no flux, which is what I think you mean.

Put in a different way, if the coil is parallel to the magnetic field, none of the magnetic field goes "through" the coil, if that makes sense. If the magnetic field is perpendicular, all of it goes through the coil.
Title: Re: quick question
Post by: P0ppinfr3sh on October 03, 2013, 06:52:33 pm: This might help you visualize it.
Title: Re: quick question
Post by: BasicAcid on October 03, 2013, 06:56:50 pm: The way I remember it is that the field lines "cut" into the plane face.

But if you can't remember that, just draw a diagram on your A3 double sided cheat sheet!