Question

A charged particle moves through a region having
only magnetic field directed perpendicular to its
direction of motion. Which of the following
quantities of the particle will not change?
​

Answer 1

Explanation:

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When a charged particle enters a magnetic field at a direction perpendicular to the direction of motion, the path of the motion is circular. In circular motion the direction of velocity changes at every point (the magnitude remains constant). Therefore, the tangential momentum will change at every point.

Answer 2

Answer:

When a charged particle enters a magnetic field at a direction perpendicular to the direction of motion, the path of the motion is circular. In circular motion the direction of velocity changes at every point (the magnitude remains constant). Therefore, the tangential momentum will change at every point.