Can a charged particle be accelerated by a magnetic field? Can its speed be increased?

When a charged particle moves in an elecltric or a magnetic field, its speed is v and acceleration is a

A charged particle moves in a circular path in a uniform magnetic field. If its speed is reduced, then its tiem period will

The magnetic field of a solenoid can be increased by

When a charged particle moves perpendicular to a magnetic field, then:

Motion of charged particle in combined electric & magnetic field

When a charged particle enters a uniform magnetic field its kinetic energy