Electric dipole in a uniform electric field

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Homework Statement



An electric dipole placed in a uniform electric field experiences a torque which tends to align the dipole parallel to the field. At the same time, due to two equal and unlike parallel forces Eq and -Eq acting at q and -q, the net force is zero. When the net force is zero, how the dipole moves parallel to the field? Please help members.

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The Attempt at a Solution


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The Attempt at a Solution

 

Answers and Replies

  • #2
tiny-tim
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hi logearav! :smile:
An electric dipole placed in a uniform electric field experiences a torque which tends to align the dipole parallel to the field. At the same time, due to two equal and unlike parallel forces Eq and -Eq acting at q and -q, the net force is zero. When the net force is zero, how the dipole moves parallel to the field?
a torque (a couple) is a net force of zero :wink:

when the dipole is at an angle to the E field, the field pulls the opposite charges in opposite but parallel directions, and that turns the dipole :smile:

(and since the field is uniform, the forces are equal in magnitude, and the centre of mass stays where it is)
 
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Mr. tiny-tim, thanks a lot for the explanation.
 

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