Consider an electron moving at a constant speed in a region where the magnetic f

Question

Consider an electron moving at a constant speed in a region where the magnetic field is constant at 7.9 gauss in the positive z-direction. The electron's motion is always perpendicular to the direction of the magnetic field. If the magnitude (the absolute value) of the Lorentz force acting on the electron is 1.434e-15 N, and the Lorentz force is in the positive x-direction, what is the speed (the absolute value) of the electron? m/s which direction does the electron move at this particular moment? positive z-direction negative x-direction positive x-direction negative y-direction negative z-direction positive y-direction

Explanation / Answer

a) 1.13*10^7 m/s

b) negative y direction.

It can detemrnined by using right hand rule.

Right hand rule:
Take your fingers in the direction of v and culr towards B, then your thumb indicates the direction of magnetic force.

This is valid for postive charges only.

for negative charges the direction of force is opposite to the direction of thumb .

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