(a) Write the expression for the force vecF acting on a particle of mass m and charge q moving with velocity vecv in a magnetic field vecB. Under what conditions will it move in (i) a circular path and (ii) a helical path? (b) Show that the kinetic enery of the particle moving in magnetic field remains constant.

(a) Write the expression for the force vecF acting on a particle of ma

1.	(a) Write the expression for the force vecF acting on a particle of mass m and charge q moving with velocity vecv in a magnetic field vecB. Under what conditions will it move in (i) a circular path and (ii) a helical path? (b) Show that the kinetic enery of the particle moving in magnetic field remains constant.
Answer» Solution :(a) (i) If direction of `VECV` is at RIGHT angles to that of `vecB`, the CHARGED particles will moave in a circular path. (ii) If `vecv` is inclined to `vecB` at an angle `theta`, where `theta != 0^@` or `pi/2` or `pi`, the charged PARTICLE will move in a helical path.

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