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**[SOLVED] Force dealing with vectors**

## Homework Statement

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

## Homework Equations

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

## 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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