Magnetic Fields & Cross Products

1. Apr 2, 2005

Soaring Crane

I desperately need help, for I am quite lost on this question:

Consider the example of a positive charge moving in the xy plane with velocity v = cos(theta)x + sin(theta)y (i.e., at angle theta with respect to the x axis). If the local magnetic field is in the +z direction, what is the direction of the magnetic force acting on the particle?

Express the direction of the force in terms of theta, as a linear combination of unit vectors, x, y, and z.

F = qBV

One hint given was to find the determinant expression for the cross product, but I don't know what this means.

Thanks for any replies.

2. Apr 2, 2005

dextercioby

$$\vec{F}_{Lorentz}=q \vec{v}\times\vec{B}$$

Do you know to compute a cross product...?Through what methods...?

Daniel.

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