The Lorentz force on a charge in a magnetic field is described by the equation F

Question

The Lorentz force on a charge in a magnetic field is described by the equation

F = q v X B

where F, v, and B are vectors (have direction) and the "X" tells us what direction F is if we know the directions of v and B.

Suppose that v is along the direction of B, that is that the charge is moving parallel to the magnetic field. What is the direction of the force that it feels?

-There is no force in that case, so no direction.

-Parallel to the field

-Perpendicular to the field

-Antiparallel (backwards) to the field

Explanation / Answer

There is no force in that case, so no direction.

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