题干

如图所示,蹄形磁体用悬线悬于O点,在磁体的正下方有一水平放置的长直导线,当导线通以由左向右的电流时,蹄形磁体的运动情况将是(      )

A:静止不动

B:向纸外运动

C:N极向纸外转动,S级向纸内转动

D:N极向纸内转动,S级向纸外转动

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答案(点此获取答案解析)

C

同类题1

                           Britain Today
Food
British people like good food, and more than half of them go to a restaurant every month. Fast food is also very popular— 30% of all adults have a hamburger every three months, but
46% have fish and chips!
Sports
British people don’t do a lot of sports. Only 17% of people go swimming every week, about 9% go cycling and 8% play golf—and only 6% of people play football( but 32% go to watch it ).
Cinema and TV
Films are very popular in Britain, and about 60% of people between 15 and 24 go to the cinema every month. At home, men watch TV for about three hours every day — two quarters more than women.
Holidays
British people love going on holiday, and have 56 million holidays every year. Most of these holidays aren’t in the UK—27% are in Spain,10% are in the USA, and 9% are in France. Maybe this is because the weather in Britain isn’t very good!
【小题1】Which food could be more popular among British adults, a hamburger or fish and chips?
A.A hamburger.B.Fish and chips.
C.Both.D.Neither.
【小题2】Which of the followings can show the right percentage (百分比) about Sports in Britain?

【小题3】hose who are interested in movies are ____.
A.menB.women
C.old peopleD.young people
【小题4】How long do British women spend watching TV every day?
A.Three hours.B.Three hours and a half
C.Two hoursD.Two hours and a half
【小题5】 British people’s favorite country for a holiday is ____.
A.SpainB.FranceC.AmericaD.Australia