问题 选择题

如图所示,平行板电容器的电容为C,带电荷量为Q,板间距离为d, 今在两板的中点处放一电荷q,则它所受电场力的大小为(   )

A.

B.

C.

D.

答案

答案:C

题目分析:平行板电容器电容,所以电压,平行板电容器中间为匀强电场电场强度,所以电荷q所受到电场力,选项C对。注意电荷量是一个极板的电荷量而不是两个极板电荷量。

填空题
阅读理解

阅读理解

     The Beatles were the most influential band in pop history. In their 8year, 12album history, Paul

McCartney, John Lennon, George Harrison and Ringo Starr altered (改变) popular culture dramatically. And it wasn't just the suits and changing lengths of hair the four Liverpool boys wore that had such an

impact, but what they seemed to stand for. The world saw them as the voice a new generation, one with

a very different attitude to life.

     Their influence was at its height in the 1960s, but their music continues to stir listeners today.

However, up until recently one aspect of The Beatles was struck in Yesterday: The music had never

been remastered (重新灌录). But on September 9 that situation came to an end, with the release of the

entire band's music in a digital makeover. It is probably the biggest reissue (重新发行) in pop music

history, said British newspaper the Financial Times.

     The albums were remastered at Abbey Road Studios in London, the location where the band

produced much of their work. The cover of their last album, Abbey Road of 1969, featured the four

young men striding (大步行走) across a zebra crossing on Abbey Road itself. It is one of the most

famous of all Beatles imagines.

     Recently, to celebrate the 40th anniversary of the album, hundreds of Beatles lovers gathered there

to show their appreciation.

     Pop groups come and go. The boy band pursued by screaming fans one year will be forgotten the

next. But The Beatles are one of the few groups whose music seems to have endured (持久). Why?

Paul McCartney's biographer Barry Miles has an explanation: "They were the first rock band…

and they just happened to be the best. They were the first band to play stadiums, to have their own

products. They were groundbreaking in every way." he says.

1. Why did The Beatles change popular culture?

A. Because of the suits of the four Liverpool boys.

B. Because of changing lengths of hair the four Liverpool boys wore.

C. Because of their albums.

D. Because of their different attitude to life.

2. Which of the following statements is FALSE according to the second paragraph?

A. The Beatles influenced people at its height in the 1960s.

B. Their music yesterday had never been remastered.

C. The entire band's music in a digital makeover will be remastered.

D. On September 9, their music came to an end.

3. What is not the reason why their music can endure?

A. That they were the first rock band.

B. That they were the best one.

C. That they were the first band to play stadiums and to have their own works.

D. That they wore special suits.

4. What's the main idea of the passage?

A. What is The Beatles?

B. Legendary band stays on top in digital times.

C. The origin of The Beatles.

D. Why is The Beatles popular with people?