A long, straight wire lies along the y-axis and carries current in the positive y-direction. A positive point charge moves along the x-axis in the positive x-direction. The magnetic force that the wire exerts on the point charge is in
A. the positive x-direction.
B. the negative x-direction.
C. the positive y-direction.
D. the negative y-direction.
E. none of the above.
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Based on our data, we think this problem is relevant for Professor Popescu's class at UCSB.