Question

The magnitude a velocity of a particle will not changed because the
magnetic force is:
Perpendicular to velocity Parallel to velocity
Both
None
* 来​

Answer 1

Answer:

both is the correct answer

Explanation:

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Answer 2

Answer:

The force exerted on a charge moving in a magnetic field is always perpendicular to both the velocity and the field. Any force perpendicular to the velocity can not change the speed (or the kinetic energy).

Explanation:

The superficial answer is simply that the Lorentz (magnetic) force is proportional to v×B, where v is the particle velocity and B is the magnetic field. Since the vector cross product is always at right angles to each of the vector factors, the force is perpendicular to v.