- #1
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.
The answer is (B) but I don't really understand why.
Based on formula of Young Modulus:
$$x=\frac{FL}{AE}$$
The second wire made of the same material so it means they have same Young Modulus. Larger extension means larger value of ##x## so to get larger value of ##x## we can increase ##F## and ##L## and decrease ##A##
I am not sure whether there is change in ##F## for first and second wire so I will just assume ##F## does not change. It leaves (B) and (C) as possible options so why is (C)...
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