If a charged particle moves through a magnetic field perpendicular to it, _.
Correct answer: C. Energy is constant but momentum changes
- A. Both momentum and energy of particle change
- B. Momentum as well as energy are constant
- C. Energy is constant but momentum changes
- D. Momentum is constant but energy changes
Explanation
If a charged particle moves through a magnetic field perpendicular to it, it acquires circular motion. During circular motion, the velocity of the body changes at each point. As momentum depends upon the velocity, by the equation, P = mv, the momentum also changes with the velocity. Only the direction of the velocity is changing, whereas its magnitude remains constant. From the equation of Kinetic energy, K.E = ½ mv², it is evident that the square of the velocity means no change in magnitude.
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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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