A dipole is placed in `x-y` plane parallel to the line `y=2x` there exist a unifrom electric field among `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)/(2)x`
D. `y=-(1)/(2)x+2`

Answer

C,D

Explanation

Torque will be perpendicular to the line `y=2x` and it should be in `xy` plane ,because electric field in z-direction .the line in option (C ) and (d) both are perpendicular to `y=2x`