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专题69自感和涡流_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5

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专题69自感和涡流_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5
专题69自感和涡流_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5
专题69自感和涡流_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5
专题69自感和涡流_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5

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专题 69 自感和涡流 1.[2022·太原师范学院附属练习](多选)如图所示是高频焊接原理示意图.线圈中通以 高频变化的电流时,待焊接的金属工件中就会产生感应电流,感应电流通过焊缝处产生很 多热量,将金属熔化,把工件焊接在一起,而工件其他部分发热很少,以下说法正确的是( ) A.电流变化的频率越高,焊缝处的温度升高的越快 B.电流变化的频率越低,焊缝处的温度升高的越快 C.工件上只有焊缝处温度升的很高是因为焊缝处的电阻小 D.工件上只有焊缝处温度升的很高是因为焊缝处的电阻大 2.(多选)如图所示,在一蹄形磁铁两极之间放一个矩形线框abcd.磁铁和线框都可以绕 竖直轴OO′自由转动.若使蹄形磁铁以某角速度转动时,线框的情况将不可能是( ) A.静止 B.随磁铁同方向转动 C.沿与磁铁相反方向转动 D.要由磁铁具体转动方向来决定 3.2021年7月25日,台风“烟花”给上海带来明显风雨影响,高达632米的上海中 心大厦在台风里却能够保持稳定,位于第 126层的“电涡流摆设式调谐质量阻尼器”起到 了关键作用.这款阻尼器由我国自主研发,重达1 000吨,在大厦受到风力作用摇晃时, 阻尼器质量块的惯性会产生一个反作用力,产生反向摆动,在质量块下方圆盘状的永磁体 与楼体地板相对,由于电磁感应产生涡流,从而使大厦减振减摆,其简化示意图如图所示 下列关于该阻尼器的说法正确的是( ) A.质量块下方相对的地板可以是导体也可以是绝缘体,对减振效果没有影响 B.安装在质量块下方的圆盘状永磁体左端为 N极右端为S极,才会有较好的阻尼效果 C.安装在质量块下方的圆盘状永磁体只有下端为 N极上端为S极,才会有较好的阻 尼效果 D.地板随大厦摆动时,在地板内产生涡流,使大厦摆动的机械能最终转化为热能逐 渐耗散掉 4.(多选)如图甲、乙所示,电感线圈 L自感系数很大,其电阻等于定值电阻 R.接通 S,电路稳定后,灯泡A均发光,则下列说法正确的是( ) A.在电路甲中,闭合S,A将逐渐变亮 B.在电路乙中,闭合S,A将逐渐变亮 C.在电路甲中,电路稳定后断开S,A将先变得更亮,然后逐渐变暗,最后熄灭 D.在电路乙中,电路稳定后断开S,A将先变得更亮,然后逐渐变暗,最后熄灭 5.[2022·山东聊城期中]如图甲所示是新型的高效节能厨具——电磁炉,又名电磁灶, 是现代厨房革命的产物.电磁炉是利用电磁感应加热原理制成的电气烹饪器具,如图乙所 示是电磁炉的工作示意图,它无需明火或传导式加热而让热直接在锅底产生,因此热效率 得到了极大的提高.下列关于电磁炉的说法正确的是( ) A.提高励磁线圈中电流变化的频率,可提高电磁炉的加热效果 B.炊具中的涡流是由励磁线圈中的恒定电流的磁场产生的 C.利用陶瓷材料制成的炊具可以在电磁炉上正常加热 D.电磁炉工作时,炉面板中将产生强大的涡流 6.如图所示,扇形铜框在绝缘细杆作用下绕点O在同一水平面内快速逆时针转动, 虚线把圆环分成八等份,其中虚线为匀强磁场的理想边界,扇形铜框恰好可以与其中一份 重合.下列线框停止最快的是( )7.[2022·河南省三模]航母上的飞机起飞可以利用电磁驱动来实现.电磁驱动原理示意 图如图所示,在固定线圈左右两侧对称位置放置两个闭合金属圆环,铝环和铜环的形状、 大小相同、已知铜的电阻率较小,不计所有接触面间的摩擦,则闭合开关S的瞬间( ) A.铝环向右运动,铜环向左运动 B.铝环和铜环都向右运动 C.铜环受到的安培力小于铝环受到的安培力 D.从左向右看,铜环中的感应电流沿顺时针方向 8.如图所示的电路中,L为一个自感系数很大、直流电阻不计的线圈,D 、D 是两个 1 2 完全相同的灯泡,E是一内阻不计的电源.t=0时刻,闭合开关S,经过一段时间后,电路 达到稳定,t 时刻断开开关S.I 、I 分别表示通过灯泡D 和D 的电流,规定图中箭头所示 1 1 2 1 2 的方向为电流正方向,选项中能定性描述电流I随时间t变化关系的是( ) 9.如图所示,上下开口、内壁光滑的铜管P和塑料管Q竖直放置.小磁块先后在两管中 从相同高度处由静止释放,并落至底部.则小磁块( ) A.在P和Q中都做自由落体运动 B.在两个下落过程中的机械能都守恒 C.在P中的下落时间比在Q中的长 D.落至底部时在P中的速度比在Q中的大
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  1. CONNECT:[ UseTime:0.000711s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000883s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000350s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000271s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000469s ]
  6. SELECT * FROM `set` [ RunTime:0.000220s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000567s ]
  8. SELECT * FROM `wendang` WHERE `id` = 369615 LIMIT 1 [ RunTime:0.003537s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 369615 [ RunTime:0.000710s ]
  10. UPDATE `wendang` SET `lasttime` = 1773089665 WHERE `id` = 369615 [ RunTime:0.000477s ]
  11. SELECT * FROM `wendang` WHERE `id` < 369615 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000415s ]
  12. SELECT * FROM `wendang` WHERE `id` > 369615 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003030s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 369615 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006734s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 369615 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005034s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 369615 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005363s ]
0.101877s