1/5单选题
难度：
1.当电流，线圈匝数一定时，插入铁芯，通电螺线管的磁性（ ）
| A | 增强 |
| B | 减弱 |
| C | 不变 |
| D | 不确定 |
- 提示1：
- IOmTgeiKr+iiq+ejgeWMlu+8jOWug+eahOejgeWcuuS4juieuue6v+euoeeahOejgeWcuueahOWPoOWKoO+8jOS7luS7rOeahOWFseWQjOS9nOeUqOS9v+ejgeaAp+WinuW8ug==
正确答案：QQ==
6ZOB6Iqv6KKr56OB5YyW77yM5a6D55qE56OB5Zy65LiO6J6657q/566h55qE56OB5Zy655qE5Y+g5Yqg77yM5LuW5Lus55qE5YWx5ZCM5L2c55So5L2/56OB5oCn5aKe5by6PGJyPuato+ehruetlOahiOS4ukE=
2/5单选题
难度：
2.关于通电螺线管磁性强弱，以下说法错误的是 ( )
| A | 取决于螺线管的匝数 |
| B | 取决于螺线管中电流强度的方向 |
| C | 取决于螺线管中有无铁芯 |
| D | 取决于电流方向 |
- 提示1：
- IOmAmueUteieuue6v+euoeejgeWcuueahOW8uuW8seWGs+WumuS6juWMneaVsOOAgeeUtea1geW8uuW8seOAgeacieaXoOmTgeiKrw==
- 提示2：
- IOeUtea1geaWueWQkeWPr+S7peehruWumuejgeaegQ==
正确答案：RA==
6YCa55S16J6657q/566h56OB5Zy655qE5by65byx5Yaz5a6a5LqO5Yyd5pWw44CB55S15rWB5by65byx44CB5pyJ5peg6ZOB6Iqv77yM6ICM55S15rWB5pa55ZCR5Y+v5Lul56Gu5a6a56OB5p6B44CCPGJyPuatpOmimOWMuuWIq+mAmueUteieuue6v+euoeejgeaAp+W8uuW8seWGs+WumuS6juWTquS6m+WboOe0oOWSjOmAmueUteieuue6v+euoeeahOejgeaegeS4jueUtea1geaWueWQkeeahOWFs+ezuzxicj7miYDku6XmraPnoa7nrZTmoYjkuLpE
3/5单选题
难度：
3.在研究磁体磁性强弱时，通过控制线圈匝数和电流一定，向其中一个插入铁芯，来研究两者通电螺线管的磁性。这种研究问题的方法是（ ）
| A | 等效法 |
| B | 转换法 |
| C | 控制变量法 |
| D | 模型法 |
- 提示1：
- IOavj+S4gOasoeWPquaUueWPmOWFtuS4reeahOafkOS4gOS4quWboOe0oO+8jOiAjOaOp+WItuWFtuS9meWHoOS4quWboOe0oOS4jeWPmO+8jOS7juiAjOeglOeptuiiq+aUueWPmOeahOi/meS4quWboOe0oOWvueS6i+eJqeeahOW9seWTje+8jOWIhuWIq+WKoOS7peeglOeptu+8jOacgOWQjuWGjee7vOWQiOino+WGs++8jOi/meenjeaWueazleWPq+aOp+WItuWPmOmHj+azleOAgg==
- 提示2：
- IOacrOmimOS4reaOp+WItuS6hue6v+WciOWMneaVsOWSjOeUtea1geS4gOWumu+8jOadpeeglOeptumTgeiKr+WvuemAmueUteieuue6v+euoeeahOejgeaAp+W8uuW8seeahOW9seWTjeOAguaYr+aOp+WItuWPmOmHj+azlQ==
正确答案：Qw==
5q+P5LiA5qyh5Y+q5pS55Y+Y5YW25Lit55qE5p+Q5LiA5Liq5Zug57Sg77yM6ICM5o6n5Yi25YW25L2Z5Yeg5Liq5Zug57Sg5LiN5Y+Y77yM5LuO6ICM56CU56m26KKr5pS55Y+Y55qE6L+Z5Liq5Zug57Sg5a+55LqL54mp55qE5b2x5ZON77yM5YiG5Yir5Yqg5Lul56CU56m277yM5pyA5ZCO5YaN57u85ZCI6Kej5Yaz77yM6L+Z56eN5pa55rOV5Y+r5o6n5Yi25Y+Y6YeP5rOV44CC5pys6aKY5Lit5o6n5Yi25LqG57q/5ZyI5Yyd5pWw5ZKM55S15rWB5LiA5a6a77yM5p2l56CU56m26ZOB6Iqv5a+56YCa55S16J6657q/566h55qE56OB5oCn5by65byx55qE5b2x5ZON44CC5piv5o6n5Yi25Y+Y6YeP5rOVPGJyPuato+ehruetlOahiOS4ukM8YnI+
4/5单选题
难度：
4.如图所示，如果使电压表的示数变大，应把滑动变阻器的滑片P向（ ）端移动，此时电磁铁的磁性将（ ）。
| A | 右 增强 |
| B | 右 减弱 |
| C | 左 增强 |
| D | 左 减弱 |
- 提示1：
- IOeUteWOi+ihqOekuuaVsOWPmOWkp++8jOagueaNruasp+WnhuWumuW+i++8jOeUtei3r+S4reeahOeUtea1geWPmOWkp+OAgg==
- 提示2：
- IOWboOatpOeUtei3r+S4reeahOeUtemYu+WPmOWwj++8jOa7keeJh+WQkeWPs+enu+WKqOOAgueUtea1geWPmOWkp++8jOejgeaAp+WinuW8uuOAgg==
正确答案：QQ==
55S15Y6L6KGo56S65pWw5Y+Y5aSn77yM5qC55o2u5qyn5aeG5a6a5b6L77yM55S16Lev5Lit55qE55S15rWB5Y+Y5aSn44CC5Zug5q2k55S16Lev5Lit55qE55S16Zi75Y+Y5bCP77yM5ruR54mH5ZCR5Y+z56e75Yqo44CC55S15rWB5Y+Y5aSn77yM56OB5oCn5aKe5by644CCPGJyPuaJgOS7peato+ehruetlOahiOS4ukE=
5/5单选题
难度：
5.如下图所示，在做电磁铁实验时，比较图（ ）可以得出线圈在通电时才有磁性。比较（）可以得出电磁铁电流越大，磁性越强；比较（ ）可以得出电磁铁线圈匝数越多，磁性越强。
| A | ①② ②④ ②③ |
| B | ①② ②③ ②④ |
| C | ②③ ①② ②④ |
| D | ①④ ②③ ②④ |
- 提示1：
- IOeglOeptumAmueUteieuue6v+euoeejgeaAp+W8uuW8se+8jOimgeS/neivgeWHuueglOeptuWklueahOWFtuS7luWboOe0oOWujOWFqOebuOWQjOOAgg==
- 提示2：
- IOimgeeglOeptuWcqOmAmueUteaXtuacieejgeaAp+imgeS/neivgeeUtea1ge+8jOe6v+WciOWMneaVsOebuOWQjO+8jOavlOi+g+W+l+WHuuKRoOKRoeespuWQiOmimOaEj+OAgg==
- 提示3：
- IOeglOeptueUtea1geWvueejgeaAp+W8uuW8seeahOW9seWTje+8jOimgeS/neivgemZpOeUtea1geWklueahOWFtuS7luWboOe0oOWujOWFqOebuOWQjO+8jOKRoeKRouespuWQiOmimOaEj+OAguWQjOeQhu+8jOacgOWQjuS4gOS4qu+8jOKRoeKRo+ato+ehruOAgg==
正确答案：Qg==
56CU56m26YCa55S16J6657q/566h56OB5oCn5by65byx77yM6KaB5L+d6K+B5Ye656CU56m25aSW55qE5YW25LuW5Zug57Sg5a6M5YWo55u45ZCM44CC5Zug5q2k6KaB56CU56m25Zyo6YCa55S15pe25pyJ56OB5oCn6KaB5L+d6K+B55S15rWB77yM57q/5ZyI5Yyd5pWw55u45ZCM77yM5q+U6L6D5b6X5Ye64pGg4pGh56ym5ZCI6aKY5oSP44CC5ZCM55CG77yM56CU56m255S15rWB5a+556OB5oCn5by65byx55qE5b2x5ZON77yM6KaB5L+d6K+B6Zmk55S15rWB5aSW55qE5YW25LuW5Zug57Sg5a6M5YWo55u45ZCM77yM4pGh4pGi56ym5ZCI6aKY5oSP44CC5ZCM55CG77yM5pyA5ZCO5LiA5Liq77yM4pGh4pGj5q2j56Gu44CCPGJyPuWboOatpOetlOahiOS4ukI=