At any point, the magnetic field lines are in the direction ofA the magnetic force on a moving negative charge B the velocity of a moving positive charge C the velocity of a moving negative charge D none of the above
Question
At any point, the magnetic field lines are in the direction ofA the magnetic force on a moving negative charge B the velocity of a moving positive charge C the velocity of a moving negative charge D none of the above
Solution
The correct answer is D. None of the above.
Magnetic field lines at any point are in the direction of the force that would be experienced by a small positive test charge if it were moving in that field. However, the direction of the force also depends on the velocity of the charge. For a positive charge, the force is in the direction of the field. For a negative charge, the force is in the opposite direction of the field. Therefore, none of the options A, B, or C are correct.
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