The direction of the magnetic field in a certain region of space is determined by firing a test charge into the region with its velocity in various directions in different trials. the field direction is 1. the direction of the velocity when the magnetic force is a maximum. 2. the direction of the velocity when the magnetic force is zero. 3. none of these 4. perpendicular to the velocity when the magnetic force is zero. 5. the direction of the magnetic force.
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