Question

A charge particle moves through a region of uniform magnetic field. Is the momentum of the field affectd?

Answer 1

The momentum of the system consisting of the particle and the field, is constant, the particle’s momentum changes, if it enters at any angle not equal to zero (or 180˚ etc.) with respect to magnetic induction, then the momentum of the field changes too, i.e. the momentum of the field is affected.

The answer:
The momentum of the field is affected in case the particle enters at any angle not equal to zero (or 180˚ etc.) with respect to magnetic induction.