题干

 请在图中标出通电后螺线管和小磁针的N极.

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答案(点此获取答案解析)

电流从螺线管的左端流入,右端流出,结合线圈的绕向,利用安培定则可以确定螺线管的左端为N极,右端为S极.

小磁针静止时,由于受到通电螺线管的作用,小磁针的N极一定靠近螺线管的S极,即小磁针的右端为N极.如图所示:

同类题3

阅读理解。

Soap operas from South Korea have been popular in China for more than twenty years now. So it is not the first time for the soap operas made in China to feel less popular. But this time, they are facing more difficulties, for The Heirs (继承者) and My Love from the Star (来自星星的你) really made a full success, which even attracted some top officials.

A senior official said he sometimes watched soap operas from South Korea, as well as House of Cards (纸牌屋), an American opera about politics (政治). These operas made both in South Korea and in America have a lot of lovers in China.

Many people agree that China's soap operas can't be much loved by most Chinese, because they are not as interesting and exciting as those operas from South Korea and America, such as My Love from the Star, a Korean love story between a time traveling professor and a famous movie star.

    However,Korean shows not only provide soap operas but also some programmings (综艺节目). Dad, Where Are We Going? is not an original (独创的)Chinese show. We learned it from South Korea although not many in China realize that fact.

Actually, China has a closer culture with South Korea. Shows from this neighbor seem to do better with their exciting stories on the Cinderella theme (灰姑娘主题). Yet they have created many popular shows whose stories tell there's no difference between men and women even though in their country men are certain to play a more important role.