A charged particle of mass m and charge q moves with a constant velocity  v = a i along the positive x-direction. It enters a region of magnetic field which is directed towards positive z-direction, from x = l, which is given by B = b k and moves in a circular path.

Find the radius of the circular path in which the particle moves.

ma/qb

Radius : r = \(\frac{mv}{qB}\)

v = a ; B = b

r = \(\frac{ma}{qb}\)