The magnetic field is caused by:
Correct answer: D. Moving positive and negative charges both
- A. Stationary charge
- B. A moving positive charge only
- C. A moving negative charge only
- D. Moving positive and negative charges both
Explanation
Option D is correct.The magnetic field is caused by both moving positive and negative charges. The magnetic force on a charged particle is given by the following equation: F = qvB sin θ where: F is the magnetic force (N) θ is the angle between the direction of the velocity and the direction of the magnetic field (°) As you can see, the magnetic force depends on the charge of the particle. The charge of the particle can be positive or negative. If the charge of the particle is positive, the direction of the magnetic force will be in the direction that is perpendicular to the direction of the velocity and the direction of the magnetic field. If the charge of the particle is negative, the direction of the magnetic force will be in the opposite direction that is perpendicular to the direction of the velocity and the direction of the magnetic field.
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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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