# What would happen to a charge in uniform magetic field when observed from a moving reference frame?

Suppose there is a uniform magnetic field everywhere in the space in -z axis direction. And suppose there is a particle at rest with respect to our reference-frame. The arrangement is shown in the figure :

Now, suppose our reference frames starts moving to the right with a constant velocity. The charged particle would appear to be moving to the left with the same velocity. Now, will there be any magnetic force acting the the charged particle ?