题目内容
（请给出正确答案）
A、The torque is zero and potential energy is minimum.
B、The torque is zero and potential energy is maximum.
C、The torque is maximum and potential energy is minimum.
D、The torque is maximum and potential energy is maximum.
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更多“An electric dipole with dipole…”相关的问题
A、positive
B、negative
C、zero
D、I don't know
A、
B、
C、
D、0
An electric dipole with dipole moment
is parallel to a long line of charge with linear charge density and at a distance
from the line. The magnitude of torque on the dipole equals ( ).
A、
B、
C、
D、
). The force on a test charge 
at a distance r from the line is ( ).
A、
B、
C、
D、
A、a
B、b
C、c
D、d
A、is just about the same size.
B、is very much stonger.
C、is very much weaker.
D、cannot be compared.
Figure shows a ring of radius
with a narrow gap of
(
) and linear charge density
. The magnitude of the electric field at the center O of the ring is （ ）.
A、
B、0
C、
D、uncertain
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