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
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
完形填空。 | |||
Look, this is my village. It is in the mountains. There 1____________ many small houses and a river. There is a bridge 2____________ the river. There aren't 3____________ fish in the river. The water is clean. The air is fresh. The sky is 4____________. The clouds are white. I can run on the grass. It's a beautiful 5____________.
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