试题与答案

如图所示,宽度为L=0.40 m的足够长的平行光滑金属导轨固定在绝缘水平面上,导

题型:计算题

题目:

如图所示,宽度为L=0.40 m的足够长的平行光滑金属导轨固定在绝缘水平面上,导轨的一端连接阻值为R=2.0Ω的电阻。导轨所在空间存在竖直向下的匀强磁场,磁感应强度大小为B=0.40 T。一根质量为m=0.1kg的导体棒MN放在导轨上与导轨接触良好,导轨和导体棒的电阻均可忽略不计。现用一平行于导轨的拉力拉动导体棒沿导轨向右匀速运动,运动速度v=0.50 m/s,在运动过程中保持导体棒与导轨垂直。求:

(1)在闭合回路中产生的感应电流的大小;

(2)作用在导体棒上的拉力的大小;

(3)当导体棒移动50cm时撤去拉力,求整个运动过程中电阻R上产生的热量。

答案:

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第二节:阅读表达(共5小题,每小题3分,满分15分)

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So how do you start forgiveness? Try following these steps:

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Don’t wait for an apology. “Many times the person who hurt you has no intention of apologizing,” Luskin says. “They may have wanted to hurt you or they just don’t see things the same way. So if you ______________________, you could be waiting an awfully long time.”

Take the control away from your offender. Mentally replaying your hurt gives power to the person who cause you pain. “Instead of focusing on your wounded feelings, learn to look for the love, beauty and kindness around you,” Luskin says.

Try to see things from the other person's perspective. If you understand that person, you may realize that he or she was acting out of ignorance, fear —even love. To gain perspective, you may want to write a letter to yourself from your offender’s point of view.

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If you always keep your hurt in mind, you will encourage the person who hurt you.

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