1.某地的地磁场磁感应强度的竖直分量方向向下,大小为4.5×10-5T.一灵敏电压表连接在当地入海河段的两岸,河宽100m,该河段涨潮和落潮时有海水(视为导体)流过.设落潮时,海水自西向东流,流速为2m/s.下列说法正确的是()A.河北岸的电势较高B.河南岸的电势较高 1. The vertical component of the magnetic field intensity of the geomagnetic field of a place is downwards, and the size is 4.5×10-5T. A sensitive voltage meter is connected to the two banks of the local river section. The river is 100m wide. There is a high tide and a low tide at the reach of the river. Seawater (as a conductor) flows through. When falling tide, the seawater flow from west to east with a flow rate of 2m/s. The following statement is correct () A. The potential of the north bank is higher B. The potential of the south bank is higher