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An electric dipole with dipole moment
is placed near a large plane sheet with a surface charge density
. Ifmakes an angle of
with the normal of the sheet, the magnitudeof the torque exerted on the dipole is .
A、0
B、
C、
D、
In a uniform electric field
, an electric dipole with dipole momentpoints in the direction of field. The torque on the dipole is .
An electric dipole with dipole momentis in a uniform electric field. When the dipole is in the unstable equilibrium state, the angle betweenandis in degree.
An electric dipole with dipole momentis 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、
An electric dipoleis placed in a uniform electric fieldwithperpendicular to. The work done by the electric field to the electric dipole in the process thatrotates from the orientation in the figure to the direction ofis _____.
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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