题目

如图所示为一测定液面高低的传感器示意图，A为固定的导体芯，B为导体芯外面的一层绝缘物质，C为导电液体，把传感器接到图示电路中，已知灵敏电流表指针偏转方向与电流方向相同．如果发现指针正向右偏转，则导电液体的深度h变化为（                                                                                                  ）                                                                                                                                             　   A．h正在增大   B．              h正在减小         C． h不变       D． 无法确定                                                                                                                                        答案：B

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