An electron travels from left to right in the plane of the paper in a magnetic field perpendicular to and directed out of the paper. It is deflected:
Correct answer: C. In upward direction
- A. In downward direction
- B. Into the paper
- C. In upward direction
- D. Out of the paper
Explanation
For a positive charge with v→(right) and B out of page, v×B= down (−y). An electron has negative charge, so its force is opposite (upwards).
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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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