An electron moves in the negative x direction, through a uniform magnetic field in the negative y direction. The magnetic force on the electron is:
Correct answer: D. In the negative z direction
- A. In the negative x direction
- B. In the negative y direction
- C. In the positive y direction
- D. In the negative z direction
Explanation
Option (D) is correct.Step by Step explanation:The velocity of electron is in negative X axis direction.v→ = - v îThe magnetic field is along negative Y axisB→ = - B ĵCharge of electron q = - eThe magnetic force is given by theF→ = q ( v→ × B→ )By substituting the values,F→ = - e ( - v î × ( - B ĵ ) )F→ = - e ( v B k̂ )Thus, the direction of force is along negative Z axis.
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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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