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.如图所示，当开关S闭合时电磁铁和物体ab相互吸引，则正确的说法是 （ ）
| A: ab一定是磁铁，且a端一定是N极。 |
| B: ab一定是磁铁，且a端一定是S极 |
| C: ab可能是磁铁，且a端是S极 |
| D: ab仅是一块铁，而不是磁铁 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOagueaNrueUtea6kOeahOato+i0n+aege+8jOWPr+S7peWIpOaWreWHuuWGsuWQkeaIkeS7rOi/meS4quaWueWQkeeahOeUtea1geaYr+WQkeS4i+eahA==
- 提示2：IOagueaNruWuieWfueWumuWIme+8jOiuqeWPs+aJi+W8r+absueahOWbm+aMh+WSjOeOr+W9oueUtea1geeahOaWueWQkeS4gOiHtO+8jOmCo+S5iOS8uOebtOeahOWkp+aLh+aMh+aJgOaMh+eahOaWueWQkeWwseaYr+eOr+W9oueUtea1geS4reW/g+i9tOe6v+S4iuejgeaEn+e6v+eahOaWueWQke+8jOWPiuieuue6v+euoeWPs+S+p+WwseaYr07mnoE=
- 提示3：IOWmguaenGFi5piv5Liq56OB6ZOB77yM5Lik6ICF55u45LqS5ZC45byV77yM5qC55o2u5byC5ZCN56OB5p6B55u45LqS5ZC45byV77yM5omA5LulYeerr+aYr1PmnoHjgILlpoLmnpxhYuaYr+S4gOWdl+mTge+8jOmAmueUteieuue6v+euoeW4puacieejgeaAp++8jOS5n+WPr+S7peebuOS6kuWQuOW8leOAgg==
- 答案：Qw==
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
本课配套习题挑战模式2/5
单选题
难度系数：
2.如图所示，ab，cd为铁棒，当电键S闭合后，ab，cd就被磁化，磁化后的极性为 （ ）
| A: a端为N极，d端为N极. |
| B: a端为S极，d端为S极 |
| C: b端为S极，d端为S极 |
| D: b端为N极，d端为N极 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOagueaNrueUtea1gea1geWQke+8jOWkluS+p+eUtea1geWQkeS4i++8jOWuieWfueWumuWIme+8jOWPs+aJi+Wkp+aLh+aMh+aMh+WQkeWPs+S+p++8jOWNs+WPs+S+p+S4uk7mnoHvvIzmiYDku6Vh6KKr56OB5YyW5oiQTuaegQ==
- 提示2：IOWcqOmAmueUteieuue6v+euoeWklumDqO+8jOejgeaEn+e6v+eUseWPs+S+p+aMh+WQkeW3puS+p++8jOaJgOS7pWTnq6/ooqvno4HljJbmiJBO5p6B
- 答案：QQ==
5qC55o2u55S15rWB5rWB5ZCR77yM5aSW5L6n55S15rWB5ZCR5LiL77yM5a6J5Z+55a6a5YiZ77yM5Y+z5omL5aSn5ouH5oyH5oyH5ZCR5Y+z5L6n77yM5Y2z5Y+z5L6n5Li6Tuaege+8jOaJgOS7pWHooqvno4HljJbmiJBO5p6B44CC5Zyo6YCa55S16J6657q/566h5aSW6YOo77yM56OB5oSf57q/55Sx5Y+z5L6n5oyH5ZCR5bem5L6n77yM5omA5LulZOerr+iiq+ejgeWMluaIkE7mnoE8YnI+5omA5Lul5q2j56Gu562U5qGI5Li6QQ==
本课配套习题挑战模式3/5
单选题
难度系数：
3.实验室有一个旧的学生直流电源，输出符号模糊不清，无法分辩正负极，小刚设计下面的判断电源两极的方法，在桌面上放上一个小磁针，在磁针东面放上一个螺线管，如图，闭合开关，磁针指南的一端向西偏转，则输出端A端为（）极。
| A: 正极 |
| B: 负极 |
| C: 先是正极然后变成负极 |
| D: 条件不足，无法确定 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOagueaNruaMh+mSiOeahOWBj+WQke+8jOW+l+WHuuWwj+ejgemSiE7mnoHmjIflkJHkuJzlkJHvvIzmoLnmja7lvILlkI3no4HmnoHnm7jkupLlkLjlvJXvvIzpgJrnlLXonrrnur/nrqHnmoTlt6bkvqfmmK9T5p6B77yM5Y+z5L6n5YiZ5pivTuaegeOAgg==
- 提示2：IOagueaNruWuieWfueWumuWIme+8jOWkp+aLh+aMh+aMh+WQkeWPs+S+p++8jOWbm+aMh+W8r+absuaJgOaMh+eahOaWueWQkeWwseaYr+eUtea1geaWueWQke+8jOaJgOS7peeUtea1geWQkeS4i++8jOagueaNrueUteWKm+S4jua1geWQkeaYk+efpe+8jEHnq6/kuLrotJ/mnoE=
- 答案：Qg==
5qC55o2u5oyH6ZKI55qE5YGP5ZCR77yM5b6X5Ye65bCP56OB6ZKITuaegeaMh+WQkeS4nOWQke+8jOagueaNruW8guWQjeejgeaegeebuOS6kuWQuOW8le+8jOmAmueUteieuue6v+euoeeahOW3puS+p+aYr1PmnoHvvIzlj7PkvqfliJnmmK9O5p6B44CC5qC55o2u5a6J5Z+55a6a5YiZ77yM5aSn5ouH5oyH5oyH5ZCR5Y+z5L6n77yM5Zub5oyH5byv5puy5omA5oyH55qE5pa55ZCR5bCx5piv55S15rWB5pa55ZCR77yM5omA5Lul55S15rWB5ZCR5LiL77yM5qC55o2u55S15Yqb5LiO5rWB5ZCR5piT55+l77yMQeerr+S4uui0n+aegTxicj7miYDku6XmraPnoa7nrZTmoYjkuLpC
本课配套习题挑战模式4/5
单选题
难度系数：
4.如图所示，开关S闭合后，位于螺线管右侧的小磁铁的N极将（ ）
| A: 顺时针转过90° |
| B: 逆时针转过90° |
| C: 转过180° |
| D: 保持静止状态 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOagueaNrueUtea6kOeahOato+i0n+aege+8jOW3puS+p+WvvOe6v+eUtea1gea1geWQkeaYr+WQkeS4iueahO+8jOagueaNruWuieWfueWumuWIme+8jOmAmueUteieuue6v+euoeW3puS+p+aYr07mnoHvvIzlj7PkvqfmmK9T5p6B
- 提示2：IOWPs+S+p+WvvOe6v+eUtea1gea1geWQkeaYr+WQkeS4i+eahO+8jOmAmueUteieuue6v+euoeW3puS+p+aYr1PmnoHvvIzlj7PkvqfmmK9O5p6B44CC
- 提示3：IOW3puWPs+ebuOS6kuaKtea2iOOAguayoeacieejgeaAp+OAguWwj+ejgemSiOS/neaMgemdmeatog==
- 答案：RA==
5qC55o2u55S15rqQ55qE5q2j6LSf5p6B77yM5bem5L6n5a+857q/55S15rWB5rWB5ZCR5piv5ZCR5LiK55qE77yM5qC55o2u5a6J5Z+55a6a5YiZ77yM6YCa55S16J6657q/566h5bem5L6n5pivTuaege+8jOWPs+S+p+aYr1PmnoHjgILlkIznkIbvvIzlj7Pkvqflr7znur/nlLXmtYHmtYHlkJHmmK/lkJHkuIvnmoTvvIzpgJrnlLXonrrnur/nrqHlt6bkvqfmmK9T5p6B77yM5Y+z5L6n5pivTuaegeOAgui/meagt+W3puWPs+ebuOS6kuaKtea2iOOAguayoeacieejgeaAp+OAguWwj+ejgemSiOS/neaMgemdmeatojxicj7mraPnoa7nrZTmoYjkuLpE
本课配套习题挑战模式5/5
单选题
难度系数：
5.如图所示，开关S接通后，两个通电螺线管将 （ ）
| A: 吸引 |
| B: 相斥 |
| C: 先吸引，后相斥 |
| D: 先相斥，后吸引 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOi/meaYr+S4gOS4qumAmueUteieuue6v+euoeeahOW5tuiBlOeUtei3r++8jOagueaNrueUtea6kOato+i0n+aegeWIpOaWre+8jOW3puS+p+mAmueUteieuue6v+euoeeUtea1geWQkeS4i++8jOagueaNruWuieWfueWumuWImeWIpOaWreWHuuWPs+err+aYr07mnoHvvIzlt6bnq6/mmK9T5p6B
- 提示2：IOWPs+S+p+mAmueUteieuue6v+euoeeahOacieefreaXtk7mnoHvvIzlt6bnq6/mmK9T5p6B44CC5qC55o2u5byC5ZCN56OB5p6B55u45LqS5ZC45byV77yM5Zug5q2k5Lik5Liq6J6657q/566h55u45LqS5ZC45byV44CC
- 答案：QQ==
6L+Z5piv5LiA5Liq6YCa55S16J6657q/566h55qE5bm26IGU55S16Lev77yM5qC55o2u55S15rqQ5q2j6LSf5p6B5Yik5pat77yM5bem5L6n6YCa55S16J6657q/566h55S15rWB5ZCR5LiL77yM5qC55o2u5a6J5Z+55a6a5YiZ5Yik5pat5Ye65Y+z56uv5pivTuaege+8jOW3puerr+aYr1PmnoHjgILlkIznkIblj7PkvqfpgJrnlLXonrrnur/nrqHnmoTmnInnn63ml7ZO5p6B77yM5bem56uv5pivU+aegeOAguagueaNruW8guWQjeejgeaegeebuOS6kuWQuOW8le+8jOWboOatpOS4pOS4quieuue6v+euoeebuOS6kuWQuOW8leOAgjxicj7miYDku6XmraPnoa7nrZTmoYjkuLpB
