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SP 212 Worksheet
Lesson 4: Ch. 22.6-22.7, Charges & dipoles in electric fields
1) An ion has a mass of 4.19 × 10−27 kg and a charge of +6e. What is the magnitude of the electric field
that will balance the gravitational force on the ion?
~ =
2) An electric dipole with a dipole moment p~ = (4.5î + 5.6ĵ) × 10−30 C · m is in an electric field E
3
(4.1 × 10 N/C)î. (a) What is the potential energy of the electric dipole? (b) What is the magnitude
of the torque acting on it? (c) If an external agent turns the dipole until its electric dipole moment is
p~ = (−5.6î + 4.5ĵ) × 10−30 C · m, how much work is done by the agent?
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