SAT Subject Physics Practice Question 438: Answer and Explanation

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Question: 438

14. A charged particle moving through a magnetic field will experience the largest force when

A. moving with the field.
B. moving against the field.
C. moving at a 45° angle to the field.
D. moving at a 90° angle to the field.
E. the particle will not be affected.

Correct Answer: D


The correct answer is (D). The more magnetic field lines a charged particle crosses, the stronger the force exerted on the particle. Moving through the magnetic field in a perpendicular path (90°) will cause the particle to cross the most field lines.

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