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2024年中考二轮复习实验专题讲义:实验8探究影响电磁铁磁性强弱的因素(有答案)_02中考总复习(2026版更新中)_04-物理-中考总复习_2024年中考复习资料_二轮复习

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2024年中考二轮复习实验专题讲义:实验8探究影响电磁铁磁性强弱的因素(有答案)_02中考总复习(2026版更新中)_04-物理-中考总复习_2024年中考复习资料_二轮复习
2024年中考二轮复习实验专题讲义:实验8探究影响电磁铁磁性强弱的因素(有答案)_02中考总复习(2026版更新中)_04-物理-中考总复习_2024年中考复习资料_二轮复习
2024年中考二轮复习实验专题讲义:实验8探究影响电磁铁磁性强弱的因素(有答案)_02中考总复习(2026版更新中)_04-物理-中考总复习_2024年中考复习资料_二轮复习

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关注公众号:陆陆高分冲刺 ~领取:最新版“小中高考-总复习”、最新试卷下载 实验8 探究影响电磁铁磁性强弱的因素 1. 电磁铁通电后具有磁性的原理(电流的_____________) 2. 磁场的基本性质(能吸引_________、钴、镍等物质) 3. 滑动变阻器的接法和作用(“一上一下”,改变电路中电流大小) 4. 转化法的应用(通过___________________________________来反映磁性的强弱) 5. 控制变量法的应用 a. 探究磁性强弱与线圈匝数的关系:控制___________不变,选择___________不同的电磁铁___________(选填“串联” 或“并联”)在电路中进行实验 b. 探究磁性强弱与电流大小的关系:选择同一个电磁铁(控制线圈匝数不变),移动滑动变阻器滑片改变电路 中电流大小进行实验 c. 探究磁性强弱与有无铁芯的关系:控制电磁铁的匝数和电路中的电流不变.分别使电磁铁中有铁芯、无铁 芯来进行实验 6. 电磁铁N、S极的判断(利用原理:_______________) 7. 电磁铁吸引的大头针下端___________(选填“分散”或“聚拢”)的原因(大头针被磁化,下端同名磁极相互排斥) 8. 实验的分析与结论总结 实验结论:电磁铁磁性的强弱与电流的大小、线圈的匝数及有无铁芯等因素有关.在线圈匝数一定时,电流 越大,电磁铁的磁性越强;在电流相同时,线圈匝数越多,电磁铁的磁性越强;电流与线圈匝数均一定时, 有铁芯的电磁铁磁性越强. 答案:磁效应;铁;电磁铁吸引大头针的多少; 电流;匝数;串联;安培定则;分散; 某同学用两个相同的大铁钉绕制成电磁铁进行实验,如图所示在“研究电磁铁磁性强弱”的实验过程中,当 S 闭合后. (1)当滑动变阻器滑片向左移动时,电磁铁A、B吸引大头针的个数____________(选填“增加”或“减小”), 说明电流越___,电磁铁的磁性越强. (2)这个实验是通过________________确定电磁铁磁性强弱的,这在实验中属于_____________法研究物理问题. (3)如图所示装置是探究电磁铁的磁性强弱与________________的关系,比较A、B吸引大头针的个数可得结论: _________________________________________. (4)小李将大铁钉换成铝棒,效果不好,这是因为_____________. 答案:增加;大;吸收大头针的多少;转换;线圈匝数;电流相等时,线圈匝数越多,电磁铁磁性越强;铝 不能被磁化 补充设问: (1)如图所示,A、B两电磁铁串联的目的是_______________________; (2)根据图示可知,A上端的极性是_______极; 0关注公众号:陆陆高分冲刺 ~领取:最新版“小中高考-总复习”、最新试卷下载 (3)实验中大铁钉上的大头针下端分散的原因是_______________________________________________; (4)他将导线绕在铁钉上制成简易电磁铁,并巧妙地通过转换法来显示电磁铁磁性的强弱,下面的 实验也用这种方法的是_____________________. A. 认识电压时,我们可以用水压来类比 B. 用光线来描述光通过的路径 C. 把敲响的音叉接触水面, 看有没有溅起水花,来判断音叉有没有振动 D. 用斜面小车研究阻力对物体运动的影响 答案:控制电流相同;N;大头针被磁化,下端同名磁极相互排斥; C (信息给予题)1. 物理学中,用磁感应强度(用字母B表示)来描述磁场的强弱,国际单位是特斯拉(用 字母T表示),磁感应强度B越大表示磁场越强;B=0表明没有磁场.有一种电阻,其阻值大小随周围磁感 应强度的变化而变化,这种电阻叫磁敏电阻,为了探究电磁铁磁感应强度的大小与哪些因素有关,小超设计 了如甲、乙两图所示的电路,图甲中电源电压恒为6V,R为磁敏电阻,图乙中的电磁铁左端靠近且正对图甲 中的磁敏电阻R 磁敏电阻R的阻值随周围磁感应强度变化的关系图象如图丙所示. 1 (1)当图乙S 断开,图甲S 闭合时,磁敏电阻R的阻值是 Ω,电流表的示数为 mA. 2 1 (2)闭合S 和S ,图乙中滑动变阻器的滑片P向右移动时,小超发现图甲中的电流表的示数逐渐减小,说 1 2 明磁敏电阻R的阻值变 ,电磁铁的磁感应强度变 . (3)闭合S 和S ,图乙中滑动变阻器的滑片P保持不动,将磁敏电阻R水平向左逐渐远离电磁铁时,小超 1 2 将测出的磁敏电阻与电磁铁左端的距离L、对应的电流表的示数I及算出的磁感应强度B同时记录在下表中, 请计算当L=5cm时,磁敏电阻R所在位置的磁感应强度B= T. L/cm 1 2 3 4 5 6 I/mA 10 12 15 20 30 46 B/T 0.68 0.65 0.60 0.51 0.20 (4)综合以上实验可以看出:电磁铁磁感应强度随通过电流的增大而 ;离电磁铁越远,磁感应强度 越 . 答案:(1)100;60;(2)大;强;(3)0.40;(4)增大;弱. (控制变量法)2. 为探究电磁铁的磁性跟哪些因素有关,小丽同学作出以下猜想: 猜想A:电磁铁通电时有磁性,断电时没有磁性 猜想B:通过电磁铁的电流越大,它的磁性越强 猜想C:外形相同的螺线管,线圈的匝数越多,它的磁性越强 为了检验上述猜想是否正确,小丽所在实验小组通过交流与合作设计了以下实验方案用漆包线(表面涂有绝 缘漆的导线)在大铁钉上绕制若干圈,制成简单的电磁铁.如下图所示的从左到右a、b、c、d为实验中观 察到的四种情况。 1关注公众号:陆陆高分冲刺 ~领取:最新版“小中高考-总复习”、最新试卷下载 a. b. c. d. 根据小丽的猜想和实验,完成下面填空: (1)通过观察电磁铁吸引大头针数目多少的不同,来判断它________________的不同;(1分) (2)通过比较______________两种情况,可以验证猜想A是正确的;(1分) (3)通过比较______________两种情况,可以验证猜想B是正确的;(1分) (4)通过比较d中两电磁铁,发现猜想C不全面,应补充____________________的条件. 答案:(1)磁性;(2)ab ;(3)bc ; (4)电流相同; 2
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  1. CONNECT:[ UseTime:0.000981s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001476s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000728s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000674s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001315s ]
  6. SELECT * FROM `set` [ RunTime:0.000596s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001516s ]
  8. SELECT * FROM `wendang` WHERE `id` = 329537 LIMIT 1 [ RunTime:0.000943s ]
  9. UPDATE `wendang` SET `liulancishu` = 3 WHERE `id` = 329537 [ RunTime:0.002016s ]
  10. UPDATE `wendang` SET `lasttime` = 1772310379 WHERE `id` = 329537 [ RunTime:0.001160s ]
  11. SELECT * FROM `wendang` WHERE `id` < 329537 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001305s ]
  12. SELECT * FROM `wendang` WHERE `id` > 329537 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001218s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 329537 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002700s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 329537 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002572s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 329537 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002668s ]
0.118048s