MasteringPhysics: Print View with Answers

ANSWER:
r^ =
Part B
Express your answer in terms of the unit vectors i^ and j^ .
ANSWER:
r^ =
Part C
Express your answer in terms of the unit vectors i^ and j^ .
ANSWER:
r^ =
Exercise 21.59
Description: An electric dipole with dipole moment p_vec is in a uniform electric field E_vec. (a) Find all the orientations of the dipole for which the
torque on the dipole is zero. (b) Which of the orientations in part (a) is stable, and which is unstable?...
An electric dipole with dipole moment p⃗ is in a uniform electric field E ⃗ .
Part A
Find all the orientations of the dipole for which the torque on the dipole is zero.
Enter your answers numerically separated by a commas.
ANSWER:
θ = ∘
0, 180 counterclockwise from the electric field direction
Also accepted: 180, 0
Part B
Which of the orientations in part (a) is stable, and which is unstable? (Hint: Consider a small displacement away from the equilibrium position and see
what happens.)
ANSWER:
stable orientation is only when p⃗ is aligned in the same direction as E ⃗
stable orientation is only when p⃗ is aligned in the opposite direction of E ⃗
stable orientations are only when p⃗ is aligned in the opposite or the same direction as E ⃗
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