Determining Magnetic Field in a Uniform Electric & Magnetic Field

AI Thread Summary
An electron with a velocity of 1.20 x 10^4 m/s in the +x direction experiences an acceleration of 2.00 x 10^12 m/s² in the +z direction within a uniform electric field of 20.0 N/C in the +z direction. The magnetic field's component in the z-direction (Bz) is determined to be zero, while the y-component (By) remains uncertain. The relationship between electric force and magnetic force is explored using the equation F = q(v x B), and the acceleration can be used to find the net force acting on the electron. The discussion emphasizes the importance of relating net force to both electric and magnetic forces, while noting that gravitational force can be ignored in this context. Understanding these relationships is crucial for determining the magnetic field's characteristics.
jesuslovesu
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Homework Statement



An electron has a velocity of 1.20 x 10^4 m/s in the +x direction. An acceleration of 2.00 x 10^12 m/s/s in the +z dir in a uniform electric and magnetic field. The electric field is 20.0 N/C in the +z direction. What can you determine about the magnetic field? What can you not determine?

Homework Equations



F = q(v x B)
e = -1.67 x 10^-19 C

The Attempt at a Solution



I can see why the mag. field would be Bz = 0 and By = something.
But I'm not sure how to find the value of By or why it will have a possible value to Bx.

I can find the electric force, but I don't know how I could relate that to magnetic force. F = Eq.

I also don't really know how to use the acceleration, it seems that the acceleration would only be useful if I needed to use the gravitational force... (I can't say the magnetic force is equal to mass*acceleration can I?)
 
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The acceleration allows you to determine the net force on the electron.
 
Is using Net force = Eq + qvxB on the right track?
 
jesuslovesu said:
Is using Net force = Eq + qvxB on the right track?
Yes, something like that. (I presume you can ignore gravity.)
 

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