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如图所示的通电线圈置于磁场中，在某时刻线圈平面刚好与磁感线的平行，则下列说法中正确的是 ( )As shown in the figure, the current-carrying coil is placed in the magnetic field. At a certain time, the coil plane is just parallel to the direction of the magnetic flux line. The correct one in the following statement is ()A.
ab 段与cd段所受的磁场力大小相等，方向相反，为一对平衡力，线圈处于平衡 The magnetic force on the AB and CD is equal, and the direction is opposite. It is a pair of balance forces, and the coil is in balance
B.
ab 段与cd所受的磁场力大小不相等，但方向相反，故线圈处于不平衡状态 The magnetic force on the AB and CD is not equal, and the direction is opposite. the coil is not in balance
C.
ab 段与cd所受的磁场力大小不相等，方向也不相反，故线圈处于不平衡状态 The magnetic force on the AB and CD is not equal, and the direction is not opposite. the coil is not in balance
D.
ab 段与cd所受的磁场力大小相等，方向相反，但不在同一条直线上，故线圈处于不平衡状态 The magnetic force on the AB and CD is equal, and the direction is opposite. But not in the same straight line, so the coil is in an unbalanced state
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【判断题】五4 GPS定位运用的是卫星信号,在室内、地下车库、交通隧道定位信号会受到影响增加定位偏差,甚至在云层密集的地域卫星信号也会受到限制使得定位精度不高或出现定位盲区。
A.
正确
B.
错误
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