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发布时间：2022-01-07
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风玫瑰图一般按（）个方位绘制。 A.4 B.8 C.12 D.16
风玫瑰图一般按（）个方位绘制。
A.4
B.8
C.12
D.16
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更多“风玫瑰图一般按（）个方位绘制。 A.4 B.8 C.12 D.16”相关的问题
, 则电流
的有效值为___。
到
的最短路线长度为（ ）
第4题
An electric dipole with dipole moment is in a uniform electric field . If the dipole is in the stable equilibrium state, which of the following statements is correct?
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.
第5题
Two paralle plates with area A are given charges Q uniformly. Their separation is much smaller than the dimensions of the plates and the fringing effect is neglected. What is the magnitude of the electric force on one plate exerted by the other?
A、
B、
C、
D、0
第6题
An electric dipole with dipole moment [图] is para...
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、
第7题
Electric charge is distributed uniformly along an infinite line in vacuum (the linear charge density is
). The force on a test charge 
at a distance r from the line is ( ).
). The force on a test charge at a distance r from the line is ( ).
A、
B、
C、
D、
第8题
The four electric dipoles are in the uniform electric field in Figure. Which one is at the stable equilibrium state? 
A、a
B、b
C、c
D、d
