问题 填空题

在如图1所示的x轴上有一个点电荷Q(图中未画出所在位置),O为x轴坐标原点,A、B两点的坐标分别为0.1m和0.4m.放在A、B两点的检验电荷q1、q2受到的电场力跟它们所带电量的关系如图2所示.则A、B两点的电场强度大小之比为______;点电荷Q的位置坐标为x=______m.

答案

(1)由图可知,B点的电场强度EB=

F
q
=0.5×103N/C,方向指向x负方向.

同理A点的电场强度EA=2N/C,方向指向x正方向.

所以A、B两点的电场强度大小之比为4:1;

(2)设点电荷Q的坐标为x,由点电荷的电场E=k

Q
r2

可知

EA
EB
=
(0.4-x)2
(x-0.1)2

解得x=0.2m.

故答案为:4:1;0.2

阅读理解

What image does the word “Britain” conjure up(令人想到)in your mind? Big Ben,the frequently changing weather, fish and chips… But have you ever wondered what British people think means “Britain”?

English playwright William Shakespeare and pop group The Beatles are the icons which inspire a sense of national pride in British people, according to a recent survey.

More than 2,000 people were asked what aspect of Britain made them feel most proud. Shakespeare topped the list, followed by the National Trust, a charity which protects places of historical or environmental interest. These beat the British currency, the pound, and the BBC.

Surprisingly, the royal family only made it to seventh on the list. “The royal family, while popular, does not inspire widespread pride,” said a spokesman for Demos, the think tank(智囊团) which carried out the research. “However, it is certainly the case that — through their unique capacity to hold and lead national events — the royal family has a central role to play in developing pride.”

Terence Blacker, a reporter for The Independent, believes the study shows the nature of new patriotism(爱国主义). “It turns out that modern British patriotism is not really about nationhood at all,” he wrote.

According to the poll, the most impressive symbols of national pride concerned private conduct and character. Volunteering topped the list, followed by politeness and patience.

小题1: According to the passage, the following statements are British most outstanding symbols except   .

A.patriotism.

B.the Beatles.

C.politeness.

D.Shakespeare.小题2:Which of the following is close to the right order of the top symbols of Britain?

A.a ,b, c, d

B.a, d, c, b

C.c, a, b, d

D.a, c, b, d小题3:The royal family does not top the list because   .

A.the royal family has a central role to play in developing pride

B.the royal family owns a lot of wealth.

C.the royal family does not attract the public attention.

D.the royal family does not influence the public as much as it used to.小题4:It can be inferred that     can make Chinese feel most proud.

A.volunteering.

B.education.

C.Luxun.

D.Population.

单项选择题