LCD's - uniform electric field

1. Masafi

65
I have attached the question, and the answer. I dont understand the answer given.

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Staff: Mentor

I agree that the answer is a bit obtuse, but do you understand how there is a torque on an electric dipole in an E-field? You can draw the F=qE force vectors if that helps...

3. Masafi

65
It is an uniform electric field, but the forces are not collinear... Why is this?

Staff: Mentor

The forces are parallel when the dipole is sideways to the field, and colinear after the dipole aligns with the field. Can you draw the forces on a dipole, and describe what those forces will do to the dipole?