A uniform electric field of strength E exists in region. A electron enters a point A with velocity v as shown. It moves through the electric field and reaches at point B. Velocity particle at B is `2v` at `30^@` with x-axis .
Then

Options

A. (II) (ii) (R)
B. (III) (iii) (P)
C. (IV) (i) (S)
D. (III) (ii) (R)

Answer

C

Explanation

For path to be helix with axis along positive z-direction, particle should experience a centripetal acceleration in xy-plane.
For the given set of options, only option (c) satisfy the condition. Path is helical with increasing pitch.