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Act.01.28

# Act.01.28 - (e Indicate the angle θ in the figure on the...

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Physics 2102, January 28, 2011 (a) The figure shows an electric dipole which is placed in an external electric field. Indicate the direction of the dipole moment. Indicate the force on each of the two charges, due to the electric field. (b) Is there a net force on the dipole? (A net force would cause the center of mass to move) (c) If the dipole were free to move, what happens to it due to the electric field (force)? Try to put your pencil down and imagine it has a positive charge at the top and a negative charge at the bottom. (d) Can you find the orientation(s) of the dipole in which the field would not make it move?

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Unformatted text preview: (e) Indicate the angle θ in the figure on the front page. (f) Consider the work done by an external force to place the dipole at this angle. Is this work positive, negative, or zero? (g) Look at the figure below. Imagine the dipole rotates from orientation (1) to orientation (2). Is the work done by the electric field positive, negative, or zero? (h) If instead, the dipole rotates from orientation (1) to orientation (4), is the work done on the dipole by the field more than, less than, or the same as in (g)?...
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Act.01.28 - (e Indicate the angle θ in the figure on the...

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