如图所示为一个圆环形导体，有一个带负电的粒子沿直径方向在圆环_爱下问搜题

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问题选择题

如图所示为一个圆环形导体，有一个带负电的粒子沿直径方向在圆环表面匀速掠过的过程，环中感应电流的情况是（　　）

A．无感应电流

B．有逆时针方向的感应电流

C．有顺时针方向的感应电流

D．先逆时针方向后顺时针方向的感应电流

答案

由题意可知，带负电的粒子沿直径方向运动，周围会产生磁场，但因沿着直径运动，则穿过圆环的合磁通量为零，因此没有感应电流，故A正确，BCD错误；

故选：A．

句型转换

句型转换。

1. She was so weak that she didn't catch up with others.(同义句转换)

She was ______ ______ _______ to catch up with others.

2. I don't like coffee. Sally doesn't like coffee, toe. (合并成一个句子)

_____ Sally _____ I _____coffee.

3. In addition to English, he has to study a second foreign language. (改成同义句)

He has to study a second foreign language ______ ______ ______ English.

4. It's really lucky of us to have such a good teacher. (改成同义句)

______ ______ really lucky ______ ______ such a good teacher.

5. I'd like to listen to music. I'd not like to watch a bad TV program.(合并成一个句子)

I'd like to listen to music ______ ______ ______ a bad TV program.

问答题简答题

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