A negatively charged electron enters a uniform magnetic field. If the electron's initial velocity is from right to left, then what is the direction of the magnetic force acting on the electron when it first enters the field? Explain.

Question

anonymous · Answer

Lorentz force, $\vec{F}$ is given by:
$\vec{F} = q(\vec{E} + \vec{v}\times\vec{B})$
$q$ is charge (remember the electron is negative!), $\vec{E}$ is electric field, $\vec{v}$ is velocity, $\vec{B}$ is magnetic field.

Do you know how to do a cross product?

anonymous · Answer

In case not, you can use your right hand to remember.

anonymous · Answer

We are not told the direction of the magnetic field?

anonymous · Answer

the magnetic field is directed into the page

anonymous · Answer

but i figured it out. thank you