题目

将一磁铁缓慢或者迅速插到闭合线圈中的同一位置处，不发生变化的物理量是（ ） A．磁通量的变化量                                       B．磁通量的变化率 C．感应电流的电流强度                                D．流过导体横截面的电量 答案：AD 【详解】 磁通量的变化量只与初末磁通量有关，与过程无关，A对；但磁通量的变化率与过程的时间有关，B错；由法拉第电磁感应定律可知迅速插到闭合线圈中的过程中产生的感应电动势较大，感应电流较大，C错；产生的电量，D对；阅读下面短文，根据内容，选择最佳答案，并将其字母代号填入题前括号内。Tomorrow is Sunday. Chen Jie isn’t going to school. She is going to get up early. In the morning, She is going to visit a science museum. She’s going there by subway. She’s going to have lunch in McDonald’s. In the afternoon, she is going to dance with her friends. At about 3:30, she is going home to do homework. Then she is going to clean her bedroom. She’s going to cook some food for her father and mother in the evening.【1】What day is it today? Today is _________.（ ）A. Sunday.B. Saturday.C. Monday【2】Chen Jie is going to have lunch___________ on Sunday. （ ）A. In McDonald’s.B. At home.C. In the school【3】—What’s Chen Jie is going to do on Sunday morning? （ ）—She is going to __________.A. dance with her friendsB. clean her bedroomC. visit a science museum【4】Chen Jie is going to the science museum by_______.（ ）A. trainB. subwayC. bus【5】Is Chen Jie a good girl? （ ）A. Yes, he is.B. No, he isn’t.C. Yes, she is.