Aparticle of mass 10 g and charge 80 mc moves through a uniform magnetic field, in a region where the free-fall acceleration is . the velocity of the particle is a constant , which is perpendicular to the magnetic field. what, then, is the magnetic field?

Explanation:

According to the first Newton's law, when a particle moves with constant velocity, the sum of forces on it is zero. So, we have:

Here is the magnetic force and is the gravitational force. The velocity of the particle is perpendicular to the magnetic field, so . Replacing and solving for B:

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