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1. The problem statement, all variables and given/known data

A uniform magnetic field of magnitude 1.47 T acts in the positive z direction.

Find the magnitude of the force exerted by the field on a proton if the proton's velocity is <3Mm/s i + 3Mm/s j>. Answer in pN

2. Relevant equations

[tex]F=QV \times B[/tex]

3. The attempt at a solution

Being a cross product, I thought that it would just take the sin of the velocity vector. Since it is going at the same speed in x and y, the angle I calculated was 45, so it is 135 from the direction of the field. So after doing all that calculation, I get .7056. Where am I doing this wrong?

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# Homework Help: Force dealing with vectors

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