问题
选择题
| 如图所示，矩形线圈有N匝，长为a，宽为b，每匝线圈电阻为R，从磁感应强度为B的匀强磁场中以速度v匀速拉出来，那么，产生的感应电动势和流经线圈中的感应电流的大小应为（ ） A．E=Bav， B．E=NBav， C．E=Bav， D．E=NBav，  |
答案
答案：D
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| 如图所示，矩形线圈有N匝，长为a，宽为b，每匝线圈电阻为R，从磁感应强度为B的匀强磁场中以速度v匀速拉出来，那么，产生的感应电动势和流经线圈中的感应电流的大小应为（ ） A．E=Bav， B．E=NBav， C．E=Bav， D．E=NBav， |
答案：D
| 选择方框中的句子完成对话。 | |
B: 1 A: Which programs do you like best on TV? B: News and sports. How about you, Claire? A: Unfortunately I don't have TV sets, 2 I also read newspapers. B: Do you read everything in the newspaper? A: No. I hate the advertisements in it. B: 3 A: There are also too many advertisements on the radios. B: 4 You needn't read the advertisements in the newspaper, but you can't avoid them with TV and the radio. A: 5 B: You are right. |