Which of the following does not affect the motion of a moving electron?
Correct answer: B. Magnetic field applied in the direction of motion
- A. Electric field applied in the direction of motion
- B. Magnetic field applied in the direction of motion
- C. Electric field applied perpendicular to the direction of motion
- D. Magnetic field applied perpendicular to the direction of motion
Explanation
Magnetic force is calculated as F = qvBsinθ. If magnetic field is applied in the direction of motion, the angle θ between velocity and the B-field is 0°. Since sin(0°) = 0, the magnetic force is zero and does not affect the electron's motion.
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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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