A Charged Particle (M = 5

question 65

Multiple Choice

A charged particle (m = 5.0 g, q = −70 μC) moves horizontally at a constant speed of 30 km/s in a region where the free fall gravitational acceleration is 9.8 m/s² downward, the electric field is 700 N/C upward, and the magnetic field is perpendicular to the velocity of the particle. What is the magnitude of the magnetic field in this region?

• A) 47 mT
• B) zero
• C) 23 mT
• D) 35 mT
• E) 12 mT

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