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A proton is projected into a space shown below where the magnetic field is directed along the $+x$-axis.

Which of the following directions of travel for the proton lead to the greatest possible magnitude of magnetic force on the proton?

A

Along the $+z$-axis.

B

At a 45 degree angle between the $+x$-axis and the $-y$-axis.

C

At a 45 degree angle between the $+z$-axis and $+y$-axis.

D

Along the $-x$-axis.

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