Question Detail
Question
A positive charge moving with constant velocity v enters a uniform B-field pointing to the top of the page. Direction of magnetic force?
Correct Answer
Option A is the correct answer.
Detailed Explanation
The direction of velocity is not specified. Without knowing the direction of motion, the direction of magnetic force cannot be determined. If the charge moves parallel to the field, force is zero.
Hint
Magnetic force depends on the direction of velocity relative to the field.