Problem

Electric field and magnetic field in a region of space is given by

\mathbf{E} = E_0 \hat{\mathbf{j}}

and

\mathbf{B} = B_0 \hat{\mathbf{j}}

. A particle of specific charge

\alpha

is released from origin with velocity

\mathbf{v} = v_0 \hat{\mathbf{i}}

. Then, path of particle Note

E_0, B_0

and

v_0

are constant values. (a) is a circle (b) is a helix with uniform pitch (c) is a helix with non-uniform pitch (d) is cycloid