A charged particle (mass = m, charge = q> 0) moves in a region of space where the magnetic field has a constant magnitude of B and a downward direction. What is the magnetic force on the particle at an instant when it is moving horizontally toward the north with speed v?
A. qvB toward the east
B. Zero
C. qvB toward the west
D. qvB upward
E. qvB toward the south
Answer: C
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.
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N/C, goes through a surface with area 
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