Under what condition the force acting on charge particle moving in the magnetic field minimum?
Correct answer: D. Both A and B.
- A. If it is moving parallel to the magnetic field.
- B. If it is moving antiparallel to the magnetic field.
- C. If the charge particle moves perpendicular to the magnetic field.
- D. Both A and B.
Explanation
The magnetic force on a moving charge is given by the equation F = qvB sin(θ), where θ is the angle between the velocity vector and the magnetic field. The force is minimum (zero) when the angle θ is 0 degrees (parallel) or 180 degrees (antiparallel), as sin(0) = sin(180) = 0. Thus, Options A, B, and D are correct. Option C is incorrect because the force is maximized when the angle is 90 degrees, not minimized.
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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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