A charged particle moves through a magnetic field in a direction perpendicular to it. Which of the following remains unchanged for the particle?
Correct answer: C. Speed
- A. The direction of the velocity changes
- B. Magnitude of the magnetic force
- C. Speed
- D. Direction
Explanation
Option C is correct.We know that force on a charged particle q due to magnetic field B is given by: F =q( v × B ) where v is the velocity of the charged particle. Thus, from the expression of force, it is clear that F is perpendicular to both v and B. As force is perpendicular to the velocity, this implies speed will not be changed only direction will be changed thus speed will remain unchanged.
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About Electromagnetism
Magnetic flux density and magnetic flux describe the strength of a magnetic field and the field passing through a surface. A charged particle moving through a magnetic field experiences a force perpendicular to its velocity and may follow circular or helical motion, depending on the angle between velocity and field.
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