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AP Physics 2
12.2 Magnetism and Moving Charges
IntermediateMCQDrawing RepresentationsConceptual24k
A coordinate system in the xy-plane where the x-axis points horizontally to the right and the y-axis points vertically upward, meeting at an origin. In the upper half-plane (y > 0), a rectangular bounded region contains a regular 3 by 3 grid of nine 'x' symbols, with a label \(\vec{B}\) in the upper-right corner. Below the region, on the y-axis at y < 0, a small circle labeled \(+e\) has a solid arrow pointing vertically upward along the y-axis toward the magnetic region, labeled \(\vec{v}\). No other labels, lines, text, or axes appear.
A positron entering a uniform magnetic field directed into the page.
A positron (a particle with the same mass as an electron but a positive charge \(+e\)) travels with constant velocity in the \(+y\)-direction. It enters a region of uniform magnetic field directed in the \(-z\)-direction (perpendicularly into the page), as shown. Which of the following diagrams best represents the direction of the initial magnetic force \(\vec{F}_B\) exerted on the positron at the moment it enters the magnetic field?

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