题目

如图，闭合开关，导体棒ab左右运动时，会发现指针左右摆动，这是_____现象，根据此现象，生活中制成了_____（选填“电动机”或“发电机”）。如将图中的灵敏电流计换成_____，则可探究磁场对电流的作用。 答案：【答案】电磁感应 发电机 电源 【解析】第一空．闭合开关，导体棒ab左右运动时，指针左右摆动，说明有感应电流产生，这种现象叫电磁感应现象；第二空．发电机是根据电磁感应现象制成的；第三空．在图中将灵敏电流计换成电源，闭合开关，电路中有电流，通电直导线在磁场中受力而运动（即磁Dear Meimei，Thank you for your last letter. I left Shanghai _1.____Tokyo a month __2.___. Now， let me tell you ___3.__interesting about Tokyo. I enjoy visiting all places of great interest here very much. __4.__ it is difficult for me5.____ find my way around the city. In Tokyo， only the important streets have names， and houses are numbered by age. For example， when the first house was built in a place， it was Number One， and the second was Number Two. Sometimes， the second house may be over a kilometer away ___6.__ the first house. Most of the people here___7.__ going to tell other persons ways. One man even __8.___a map for me when I asked him how I could _9.__the station. How strange it is! Please write to ____10._soon.Yours，Fangfang