A 5*10^(-6) C particle moves through a region containing the uniform magnetic field and the uniform electric field . At a certain instance the velocity of the particle is

Question

A 5*10^(-6) C particle moves through a region containing the uniform magnetic field <-20mT,0,0> and the uniform electric field <0,300V/m,0>. At a certain instance the velocity of the particle is <17,-11,7)km/s. At that instant and in unit-vector notation, what is the net electromagnetic force on the particle? (Answer = <0,.8,-1.1>mN)

anonymous · Answer

Here is what I do to get the answer: F = qvxB + qE F = q(<17000,-11000,7000>X<-.02,0,0> + <0,300,0>) = <0,.0022, -.0011>N...don't know where I'm going wrong.

experimentx · Answer

F = eE +eb*(cross).v

anonymous · Answer

Yes, I have that already...

anonymous · Answer

oooh you're saying it's BcrossV instead of VcrossB?
Strange, my formula says VcrossB

experimentx · Answer

I must be confused one then ... I haven't used that formula in for long time.

experimentx · Answer

yeah it was vxB http://upload.wikimedia.org/wikipedia/en/math/3/0/e/30e07241f7dce068047cbe7fb1ca21b2.png

anonymous · Answer

So then what am I doin wrong?