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 a 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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