Angle between proton velocity and B-field

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The discussion centers on the relationship between the angle of proton velocity and the magnetic field (B-field). It clarifies that both angles involved in the problem are supplementary, meaning they add up to 180 degrees. Either angle can be used if only the magnitude of the cross product is needed. The participants confirm the correctness of using either angle in this context. The conversation emphasizes the simplicity of the solution while addressing potential confusion.
member 731016
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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