A charged particle enters a uniform magnetic field perpendicular to the direction of magnetic field. How will its kinetic energy and momentum change?
Correct answer: D. None of these
- A. K.E increases, P.E decreases
- B. K.E decreases, P.E increases
- C. Both A and B
- D. None of these
Explanation
Option D is correct.As the charged particle enters perpendicular to the magnetic field, the force will act perpendicular to the velocity. Thus the particle starts moving in the circular path. As force and displacement are perpendicular, the work done will be zero and kinetic energy will not change. But as it moves in circular path direction of momentum will change but the magnitude is 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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