A dipole is placed in xy plane parallel to the line `y = 2x`. There exists a uniform electric field along z-axis. Net force acting on the dipole will be zero. But it can experience some torque. We can show that the direction of this torque will be parallel to the line.

Options

A. `y = 2x + 1`
B. `y = -2x `
C. `y = -1/2x`
D. `y = -1/2 x + 2`

Answer

C, D

Explanation

c.,d.
Torque will be perpendicualr to the line `y=2x` and it should be in `xy` plance, because electric field is in `z-`directio. The lines in options (c) and (d) are perpendicular to `y=2x.