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AP Physics 2
12.2 Magnetism and Moving Charges
BeginnerMCQMathematicalConceptual25.2k
A 2D coordinate system with horizontal x-axis pointing right and vertical y-axis pointing up. Three horizontal rightward parallel arrows represent a uniform magnetic field, labeled B. In Scenario 1, a small positive circle with a plus sign moves rightward along the x-axis with a velocity vector labeled v_1 parallel to B. In Scenario 2, a small positive circle moves upward along the y-axis with a velocity vector labeled v_2 perpendicular to B. No other labels, lines, text, or axes appear.
Particles moving parallel and perpendicular to a magnetic field.
A particle with positive charge \(q\) enters a region containing a uniform magnetic field of magnitude \(B\) directed along the positive \(x\)-axis. In Scenario 1, the particle moves with speed \(v_0\) along the positive \(x\)-axis. In Scenario 2, an identical particle moves with speed \(v_0\) along the positive \(y\)-axis. Which of the following pairs correctly gives the magnitudes of the magnetic forces \(F_1\) and \(F_2\) exerted on the particles in Scenario 1 and Scenario 2, respectively?

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