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Magnetic fields 
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#1
Mar2304, 02:52 PM

P: 11

A Fe+ ion is traveling at 200 m/sec in a direction 20 deg south of west at a point. The magnetic field at that point is 0.4 T directed at 10 deg west of south. What is the instantaneous magnetic force that acts on the Fe is how many newtons?



#2
Mar2304, 03:19 PM

P: 1,004

The magnetic force on a charge that travels through a magnetic field is:
[tex]\vec F_m = q\vec V \times \vec B = qVB\sin \alpha[/tex] ([itex]\alpha[/tex] being the angle between the field vector and the velocity vector of course.) 


#3
Mar2404, 10:30 AM

Emeritus
Sci Advisor
PF Gold
P: 29,239

Since the original question involves the exact vectorial direction of the force, and since cross products are not commutative, this can produce an error in the direction. Zz. 


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