中学生网络课堂本课配套习题挑战模式1/5
单选题
难度系数：
1.关于电磁铁，下面说法中正确的是（ ）
| A: 电磁铁是根据电磁感应原理制作的 |
| B: 电磁继电器中的磁体，必须用电磁铁 |
| C: 电磁继电器中的磁体，可以用永磁体，也可以用电磁铁 |
| D: 电磁铁中的铁芯，可以用钢棒代替 |
一次做对，真牛！
+5奖励规则>
- 提示1：55S156OB57un55S15Zmo5Lit55qE56OB5L2T77yM5b+F6aG755So55S156OB6ZOB77yM6YCa6L+H55S15rWB55qE6YCa5pat5o6n5Yi256OB5oCn55qE5pyJ5peg77yM5LiN6IO955So5rC456OB5L2T
- 答案：Qg==
QeOAgeeUteejgemTgeaYr+WIqeeUqOeUtea1geeahOejgeaViOW6lOWItuaIkOeahO+8jOaVhemAiemhuUHplJnor6/vvJs8YnI+QuOAgeeUteejgee7p+eUteWZqOS4reeahOejgeS9k++8jOW/hemhu+eUqOeUteejgemTge+8jOmAmui/h+eUtea1geeahOmAmuaWreaOp+WItuejgeaAp+eahOacieaXoO+8jOS4jeiDveeUqOawuOejgeS9k++8jOaVhemAiemhuULmraPnoa7vvJs8YnI+Q+OAgeeUteejgee7p+eUteWZqOS4reeahOejgeS9k++8jOW/hemhu+eUqOeUteejgemTge+8jOmAmui/h+eUtea1geeahOmAmuaWreaOp+WItuejgeaAp+eahOacieaXoO+8jOS4jeiDveeUqOawuOejgeS9k++8jOaVhemAiemhuUPplJnor6/vvJs8YnI+ROOAgemSouajkuaYr+awuOejgeS9k++8jOejgeWMluWQjuS4jeWuueaYk+mAgOejge+8jOaVheS4jeiDveeUqOmSouajkuS7o+abv+mTgeiKr++8jOaVhemAiemhuUTplJnor6/vvJs8YnI+5pWF6YCJQu+8jg==
本课配套习题挑战模式2/5
单选题
难度系数：
2.下列关于电磁铁的说法中正确的是（ ）
| A: 电磁铁的磁性强弱跟通过它的电流强弱无关 |
| B: 通过电磁铁的电流方向改变,其磁性强弱也随之改变 |
| C: 在同一电磁铁中加铜心时比加铁心时的磁性弱 |
| D: 相同形状的电磁铁的磁性强弱跟线圈匝数无关 |
一次做对，真牛！
+5奖励规则>
- 提示1：5aaC5p6c5Zyo55S156OB6ZOB5Lit5Yqg5YWl6ZOc5b+DLOeUseS6jumTnOS4jeiDveiiq+ejgeWMlizlm6DogIzkuI3og73lop7liqDno4HlnLrlvLrluqY=
- 答案：Qw==
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
本课配套习题挑战模式3/5
单选题
难度系数：
3.关于电磁铁,下列说法不正确的是（ ）
| A: 电磁铁的磁性强弱跟通过它的电流强弱有关 |
| B: 电磁铁的铁芯可以用钢来做 |
| C: 电磁铁在产生磁性时需要通电 |
| D: 通电螺线管插入一个铁芯,其磁性大大增强 |
一次做对，真牛！
+5奖励规则>
- 提示1：55S156OB6ZOB55qE6ZOB6Iqv5b+F6aG755So6ZOB5YGa5p2l5YGa
- 答案：Qg==
QS7nlLXno4Hpk4HnmoTno4HmgKflvLrlvLHot5/pgJrov4flroPnmoTnlLXmtYHlvLrlvLHmnInlhbM8YnI+Qy7nlLXno4Hpk4HlnKjkuqfnlJ/no4HmgKfml7bpnIDopoHpgJrnlLU8YnI+RC7pgJrnlLXonrrnur/nrqHmj5LlhaXkuIDkuKrpk4Hoiq8s5YW256OB5oCn5aSn5aSn5aKe5by66YO95q2j56GuPGJyPkLplJnor68s55S156OB6ZOB55qE6ZOB6Iqv5b+F6aG755So6ZOB5YGa5p2l5YGaLA==
本课配套习题挑战模式4/5
多选题
难度系数：
4.如图是探究影响电磁铁磁性强弱因素的实验，下列说法正确的是（ ）
| A: 闭合开关后，调节滑动变阻器的滑片，使电流表示数相同，发现电磁铁乙吸引大头针的数目比甲多 |
| B: 电磁铁中铁芯的作用是改变磁场的方向 |
| C: 如图甲，滑片向右移动，发现电磁铁吸引大头针的数目增大 |
| D: 保持电流表示数不变，这是为了研究电磁铁的磁性强弱与匝数的关系 |
一次做对，真牛！
+5奖励规则>
- 提示1：6ZOB6Iqv6IO95aSf6KKr56OB5YyW77yM55S156OB6ZOB5Lit6ZOB6Iqv55qE5L2c55So5piv5aKe5by655S156OB6ZOB55qE56OB5oCn
- 提示2：56OB6ZOB56OB5oCn55qE5by65byx5LiO55S15rWB55qE5aSn5bCP5ZKM57q/5ZyI55qE5Yyd5pWw5pyJ5YWz77yM5L+d5oyB55S15rWB6KGo56S65pWw5LiN5Y+Y77yM6L+Z5piv5Li65LqG56CU56m255S156OB6ZOB55qE56OB5oCn5by65byx5LiO5Yyd5pWw55qE5YWz57O7
- 答案：QSxE
QeOAgeeUseWbvuefpe+8jOeUsueUteejgemTgeavlOS5meeUteejgemTgee6v+WciOWMneaVsOWwke+8jOWcqOeUtea1geebuOWQjOaXtu+8jOeUsueahOejgeaAp+avlOS5meeahOejgeaAp+W8se+8jOeUteejgemTgeS5meWQuOW8leWkp+WktOmSiOeahOaVsOebruavlOeUsuWkmu+8jOaJgOS7pUHmraPnoa7vvJs8YnI+QuOAgemTgeiKr+iDveWkn+iiq+ejgeWMlu+8jOeUteejgemTgeS4remTgeiKr+eahOS9nOeUqOaYr+WinuW8uueUteejgemTgeeahOejgeaAp++8jOaJgOS7pULplJnor6/vvJs8YnI+Q+OAgeeUseWbvuWPr+efpe+8jOeUsua7keeJh+WQkeWPs+enu+WKqOaXtu+8jOmAmui/h+eUteejgemTgeeahOeUtea1geWHj+Wwj++8jOeUteejgemTgeeahOejgeaAp+S8muWHj+W8se+8jOeUteejgemTgeWQuOW8leWkp+WktOmSiOeahOaVsOebruWHj+Wwke+8jOaJgOS7pUPplJnor6/vvJs8YnI+ROOAgeejgemTgeejgeaAp+eahOW8uuW8seS4jueUtea1geeahOWkp+Wwj+WSjOe6v+WciOeahOWMneaVsOacieWFs++8jOS/neaMgeeUtea1geihqOekuuaVsOS4jeWPmO+8jOi/meaYr+S4uuS6hueglOeptueUteejgemTgeeahOejgeaAp+W8uuW8seS4juWMneaVsOeahOWFs+ezu++8jOaJgOS7pUTmraPnoa7vvI48YnI+5pWF6YCJQUTvvI4=
本课配套习题挑战模式5/5
单选题
难度系数：
5.如图所示是研究电磁铁磁性的实验．闭合开关后，下列说法正确的是（ ）
| A: 电磁铁的下端是N极 |
| B: 电磁铁能吸引大头针是电磁感应现象 |
| C: 将铁钉换成铜棒会使磁性增强 |
| D: 滑片P向左移动，电磁铁吸引大头针的数目会增多 |
一次做对，真牛！
+5奖励规则>
- 提示1：55S15rWB5LuO5LiK56uv5rWB5YWl77yM5LiL56uv5rWB5Ye677yM5pWF5o2u5a6J5Z+55a6a5YiZ5Y+v55+l77yM5q2k5pe255S156OB6ZOB55qE5LiL56uv5pivTuaege+8jOS4iuerr+aYr1PmnoE=
- 答案：QQ==
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
