Moving electrons and magnetic fields

[heston1980]

An electron is moving through a 0.002T magnetic field as described below. Show the direction the electron will be pushed by the magnetic field, and calculate teh amount of force exerted on the electron if the electron is moving at 3x10^5 m/s


here is what the paper looks like

x x x x x x x x

x x x x x x x x

x x x x x x x x

x x x x x x x x
^
e - is going straight thru the middle of the x's

I'm assuming B=.002T and the equation I would use is Fbw = BIL?

 

[gneill]

Do a search on "Lorentz Force".

 

[1994Bhaskar]

NO NEED AT ALL TO USE THAT BIL?IS THERE ANY CURRENT HERE?
gneill is right!
USE LORENTZ FORCE WHICH FOR MAGNETIC FIELD IS:F=QVB.
HERE Q IS CHARGE, VELOCITY OF CHARGE AND B IS MAGNETIC FIELD APPLIED.
ACTUALLY IT IS VROSS-PRODUCT OF V & B VECTOR.(V x B=VB*sin(m) WHERE M IS ANGLE WHICH FIELD MAKES WITH PLANE IN WHICH CHARGE IS LOCATED)
IN YOUR QUESTION THE X X X
X X X MEANS THAT MAGNETIC FIELD IS PERPENDICULAR TO CHARGE.
=>M=90⁰ OR 90 DEGREES.NOW SIN(90)=1.
THEREFORE F=QVB!
REMEMBER LORENTZ FORCE IS OBTAINED FROM EXPERIMENT'S--WE ARE THUS FORCED TO REMEMBER IT WITHOUT PROOF!