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Electromagnetic forces 
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#1
Aug2809, 04:42 PM

P: 15

Speed = distance/time and current = charge/time. Explain how F=BIl is actually the same equation as F= Bqv but considered for many charges in a group?
can someone please explain with working out please? thanks 


#2
Aug2809, 05:46 PM

P: 1,133

Lets say that you had a wire with a length l. Lets say that traveling through that length is a net charge q, with an average velocity of v. v = distance/time, in which in this case, v = l/t. The current is I = charge/time = q/t. Therefore, F = B*q*(l/t) = B*(q/t)*l = BIl.



#3
Aug3009, 06:13 AM

P: 15

thanks a lot!



#4
Aug3109, 03:08 PM

P: 4,663

Electromagnetic forces
For clarity, these two equations (part of the Lorentz Force Law) are written as
F = l(I x B) = q(v x B) where x indicates the cross product. meaning that the vectors F,I and B; or F,v,and B are all mutually orthogonal. 


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