A magnetic field that varies in magnitude from point to point but has a constant direction (east to west) is set up in a chamber. A charged particle enters the chamber and travels undeflected along a straight path with constant speed. What can you say
As the particle travels undeflected through the magnetic field it means that the particle moves parallel to the magnetic field present in the region. So, the initial velocity of the particle will be parallel or anti-parallel to the field.
