闭合金属圆环放在匀强磁场中，使圆环的一半在磁场外，另一半在磁场内，如图所示，若使圆环产生顺时针方向的感应电流，应该使圆环：（ ）
A．以MN为轴，上半部向外，下半部向里转动
B．以MN为轴，上半部向里，下半部向外转动
C．以PQ为轴，左半部向外，右半部向里转动
D．以PQ为轴，左半部向里，右半部向外转动
若使圆环产生顺时针方向的感应电流，根据安培定则，感应电流的磁场的方向向里，根据楞次定律可得，线圈中的磁通量减小．
A、B、以MN为轴转动，穿过线圈的磁通量为：Φ=BScosθ，线圈与B之间的夹角变小，磁通量减小，都能够产生顺时针方向的电流．故A正确，B正确；
C、D、以PQ为轴转动，穿过线圈的磁通量为：Φ=BScosθ，线圈与B之间的夹角变小，磁通量减小，都能够产生顺时针方向的电流．故C正确，D正确．
故选：ABCD．
第二节摘录信息 (共5小题；每小题1分，满分5分) {007} 阅读短文，根据所读内容在文后53--57的空格里填上适当的单词或短语，并将答案转写到答题 卡上。注意：每空不超过3个单词。 Advertisements can be placed nearly everywhere to catch our attention, they have even become popular on the Internet. That means that customers can see them at any time and from any place. In cities, you can see them on the sides of buses, taxis and trains. There are advertisements high up on the sides of buildings. The names of famous brands, like Nike, Pepsi, Guess and Apple, appear on shoes, clothing and bags. So when people use these branded products in their daily life, they are helping the products to sell more of them. Every company gets you to recognize its name. The company name is always printed in the same way, using the same letters and the same colors. So, when customers see the same “look” of the company name day-in and day-out, they begin to recognize it without having to read it. We cannot predict the future of advertising, but one thing is certain- advertisements are here to stay and will always change the way of our life.
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