题目

All students need to have good study habits(习惯).When you have good study habits, you learn things quickly. You also remember them easily.Do you like to study in the living room? This is not a good place because it is usually too noisy. You need to study in a quiet place, like your bedroom. A quiet place will help you only think about one thing. When you study, don't think about other things at the same time. Only think about your homework. If you do this, you will do your homework more quickly and you will make fewer mistakes. Good study habits are very important. If you do not have them, （本题供使用选修1-1教材的考生作答）如图所示，将条形磁铁分别以速度υ和2υ插入线圈，电流表指针偏转角度（　　）A．以速度υ插入时大B．以速度2υ插入时大C．一样大D．不能确定