A charged particle begins to move from the origin in a region which has a uniform magnetic field in the x-direction and a uniform electric field in the y-direction. Its speed is v when it reaches the point (x, y, z). Then, v will depend

Options

A. only on x
B. only on y
C. on both x and y, but not z
D. on x,y and z

Answer

b

Explanation

For a particle moving in any combination of electric and magnetic fields, work is done only by the electric field.
Energy of the particle =work done by the electric field
=electirc field `xx` displacement in the direction of the electric
field.