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LCD's - uniform electric field

  1. Jan 25, 2010 #1
    I have attached the question, and the answer. I dont understand the answer given.
     

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  3. Jan 25, 2010 #2

    berkeman

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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...
     
  4. Jan 26, 2010 #3
    It is an uniform electric field, but the forces are not collinear... Why is this?
     
  5. Jan 26, 2010 #4

    berkeman

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    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?
     
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