Question

Why can't magnetic force not change particle's speed?

Answer 1

Answer:

because it is used to attract the metals

Answer 2

HEYA!

The magnetic force (assuming you mean the force that a particle experiences when traveling through a magnetic field) does accelerate the particle. It does so in a direction perpendicular to the field and to the direction of the particle, the term in the force equation is the vector product between the velocity and the field. Because the acceleration is normal (which means perpendicular) to the velocity, the speed (which is the magnitude of the velocity) does not change, but the velocity most certainly does.

E.g., the charged particles from the sun are captured by Earth‘s magnetic field and then spiral along the field lines until the hit the atmosphere where they become the Northern or Southern Lights.

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