SAT Subject Physics Practice Question 92: Answer and Explanation

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Question: 92

2. The velocity of a particle of charge +4.0 × 10–9 C and mass 2 × 10–4 kg is perpendicular to a 0.1-tesla magnetic field. If the particle’s speed is 3 × 104 m/s, what is the acceleration of this particle due to the magnetic force?

A. 0.0006 m/s2
B. 0.006 m/s2
C. 0.06 m/s2
D. 0.6 m/s2
E. None of the above

Correct Answer: C


The magnitude of the magnetic force is FB = qvB, so the acceleration of the particle has magnitude

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