• Right-hand rule: To determine the direction of the magnetic force on a positive charge, use the right-hand rule. • Applying the rule: Point your thumb in the direction of the velocity (to the right), your fingers in the direction of the magnetic field (out of the page), and your palm will point towards the direction of the force (downward).
A positive change moving with a constant velocity v enters a region of a uniform magnetic field pointing out the page. What is the direction of the magnetic force on the charge?
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