01 The dipole moment is 4 C m and the electric field is 6 N/C. What is the potential energy in the parallel position?
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Answer and explanation
Correct answer: C. −24 J
Explanation: The potential energy of a dipole in a uniform electric field is U = −pE cos θ. In the parallel position, the dipole moment is along the field, so θ = 0° and cos 0° = 1. Therefore U = −4 × 6 × 1 = −24 J. Option C is correct. A has the wrong sign, B ignores the interaction energy, and D does not use both physical quantities correctly.