如图所示，匀强磁场中有一矩形闭合线圈abcd，线圈平面与磁场垂直．已知线圈的匝数N=100，边长ab=1.0m、bc=0.5m，电阻r=2Ω．磁感应强度B在0～1s内从零均匀变化到0.2T．在1～_刷题宝

题干

如图所示，匀强磁场中有一矩形闭合线圈abcd，线圈平面与磁场垂直．已知线圈的匝数N=100，边长ab=1.0m、bc=0.5m，电阻r=2Ω．磁感应强度B在0～1s内从零均匀变化到0.2T．在1～5s内从0.2T均匀变化到﹣0.2T，取垂直纸面向里为磁场的正方向．求：

上一题下一题 0.0难度选择题更新时间:2016-07-11 04:12:12

答案(点此获取答案解析）

同类题1

解释下面各句中加下划线的词语。

①肉食者鄙 ____

②牺牲玉帛 ____

③望其旗靡 ____

④必以信 ____

⑤齐师败绩 ____

⑥一鼓作气 ____

⑦小大之狱 ____

⑧既克，公问其故 ____

⑨彼竭我盈 ____

同类题2

	Huang Xiaoming Chinese actor Huang Xiaoming visited the panda base(据点) in Sichuan province. During his visit, Huang put on a keeper's suit and tried cutting bamboo, cleaning cages and feeding the pandas. Huang also adopted a pair of panda twins with a gift of one million yuan.
	Angelina Jolie Hollywood actress Angelina Jolie can do all kinds of things on screen. It looks like she's good at everything, shooting, fighting and killing. But there's one thing she's afraid of—cooking. The 33-year-old actress says she was never able to master cooking skills.“I don't cook—it's the one thing I can't do!”she says.
	Chen Luyu Chinese hostess Chen Luyu is famous for her popular talk show. She set up an online version of her show at Sina.com. People have grown tired of Chen's show, especially her habit of constantly asking guests, “really?”. But the producer of the show supports Chen. “She's one of the few Chinese hosts who knows how to control her desire to express herself and let the guests speak freely in an interview.”

同类题3

读下面的文字，回答问题。

萤火虫是大家都很熟悉的一种昆虫，即使你没有亲眼见过，也至少听说过它的名字。萤火虫的肚子顶端会发出微弱的光亮，就好像是挂了一盏小灯。在宁静的夏夜，你经常会看到它们在草丛中游荡。

萤火虫长着三对短短的腿，它们利用这三对小短腿迈着碎步跑动。雄性萤火虫到了成虫时期，会长出鞘翅，就像其他甲虫一样。而雌虫则永远都保持着幼虫阶段的形态，无法享受飞翔的快乐。萤火虫有色彩斑斓的外衣。它的身体呈棕栗色，胸部是柔和的粉红色，边缘则点缀着一些鲜艳的棕红色小斑点。

以上文字选自法国作家的优秀科普著作《昆虫记》。“即使你没有亲眼见过，也至少听说过它的名字”一句中，“即使……，也……”连接的两个分句之间是____关系。“在宁静的夏夜，你经常会看到它们在草丛中游荡”一句中，“在宁静的夏夜”充当的句子成分是____，“经常”的词性是____。“萤火虫有色彩斑斓的外衣”一句中，“色彩斑斓”的短语结构类型是____。请从选文中找出一个运用比喻修辞的句子抄写在下面：____。

同类题4

若| a |＝2，| b |＝a，则a＋b为（）

同类题5

①点燃蜡烛，把一根火柴梗放在蜡烛的火焰中，如图，约1s后取出可以看到火柴梗的____（选填图中字母）处最先炭化，说明此处温度最高．

②干冷的烧杯内壁出现____现象，澄清的石灰水____．

结论：蜡烛燃烧生成水和二氧化碳．其文字表达式为____．

小学学科试题库

初中学科试题库

高中学科试题库