What is the work done by a magnetic field on a moving charge?

Is any work done by magnetic field on moving charge perpendicular to the magnetic field?

A charged particle in a plasma trapped in a magnetic bottle leaks out after a millisecond. What is the total work done by the magnetic field during the time, the particle is trapped?

Is the direction of magnetic force exerted by a magnetic field on a moving charge the same as that of magnetic field?

What isi the importance of radial magnetic field in moving coil galvanometer?

What is the nature of magnetic field in a moving coil galvanometer?