Angle between proton velocity and B-field

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SUMMARY

The discussion centers on the relationship between the angle of proton velocity and the magnetic field (B-field) in the context of cross products in physics. It is established that the two angles in question are supplementary, meaning they add up to 180 degrees. Therefore, either angle can be used if only the magnitude of the cross product is required. This clarification is essential for understanding vector relationships in electromagnetic contexts.

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Homework Statement
Please see below
Relevant Equations
F = qV x B
For this problem,
1670900377412.png

The solution is,
1670900463532.png

However, this may seem like a silly question, but do we need both angles?

Many thanks!
 

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The two angles are supplementary. Either one is correct if you only have the magnitude of the cross product.
 
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kuruman said:
The two angles are supplementary. Either one is correct if you only have the magnitude of the cross product.
Thank you @kuruman !
 

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