Recent content by I done know

Ah, so because the force is perpendicular to the velocity, the force is perpendicular to the displacement.

Is it that the force is perpendicular to the magnetic field and work must be parallel to the displacement?

I see, then dv/dt is 0 when the B field is static, so if a=0 then F=0 then W=0. Sound right? Unfortunately this was on our last exam, and my answer was that W=qV and induced voltage is only a result of B flux changing in time.

Why can't a static magnetic field (not changing in time) ever do work? How do I express this formulaically? My only guess is that work is zero for a closed path.