在點電荷Q形成的電場中有一點A,當(dāng)一個﹣q的檢驗電荷從電場的無限遠(yuǎn)處移到電場中的A點時,靜電力做功為+W,則檢驗電荷在A點的電勢能和電勢分別為                                                、         .              

練習(xí)冊系列答案
相關(guān)習(xí)題

科目:高中物理 來源: 題型:


下列說法中正確的是(  )

A.晶體一定具有規(guī)則的幾何外形

B.葉面上的小露珠呈球形是由于液體表面張力的作用

C.當(dāng)液晶中電場強(qiáng)度不同時,液晶對不同顏色光的吸收強(qiáng)度不同

D.當(dāng)氫氣和氧氣的溫度相同時,它們分子的平均速率相同

E.氣體分子單位時間內(nèi)與單位面積器壁碰撞的次數(shù),與單位體積內(nèi)的分子數(shù)和溫度有關(guān)

查看答案和解析>>

科目:高中物理 來源: 題型:


如圖所示,甲、乙兩個電路都是由一個靈敏電流表G和一個變阻器R組成的,下列說法正確的是(    )                                                                                      

①甲表是安培表,R增大時量程增大                                                                              

②甲表是安培表,R增大時量程減小                                                                              

③乙表是伏特表,R增大時量程增大                                                                              

④乙表是伏特表,R增大時量程減。                                                                           

    A.    ①③        B. ①④  C.    ②③       D. ②④

                                                                                                                                      

查看答案和解析>>

科目:高中物理 來源: 題型:


真空中兩個固定的相距較近且電性相同的點電荷A和B,現(xiàn)釋放B且B只在A的庫侖力作用下運(yùn)動,則B在運(yùn)動過程中受到的庫侖力(                                                                           )                                   

    A.           始終保持不變  B.                  不斷增加 C. 不斷減小       D. 先增大后減小

                                                                                                                                   

查看答案和解析>>

科目:高中物理 來源: 題型:


下列各量中,與檢驗電荷無關(guān)的物理量是(                          )                                   

    A.           電場力F          B.                  電場強(qiáng)度E     C. 電勢差U D. 電場做的功W

                                                                                                                                   

查看答案和解析>>

科目:高中物理 來源: 題型:


如圖所示,在光滑絕緣豎直細(xì)桿上,套有一小孔的帶電小球,小球質(zhì)量為m,帶電荷量為﹣q,桿與以正電荷Q為圓心的某一圓周交于BC兩點,小球從A點無初速釋放,AB=BC=h,小球滑到B點時速度大小為,已知q遠(yuǎn)小于Q,求:                                                                                                                                

①AB兩點間的電勢差;                                                                                              

②AC兩點間的電勢差;                                                                                              

③小球滑到C點時速度的大。                                                                                  

                                                                                                             

                                                                                                                                   

查看答案和解析>>

科目:高中物理 來源: 題型:


圖中兩條平行虛線之間存在勻強(qiáng)磁場,虛線間的距離為l,磁場方向垂直紙面向里.a(chǎn)bcd是位于紙面內(nèi)的梯形線圈,ad與bc間的距離也為l.t=0時刻,bc邊與磁場區(qū)域邊界重合(如圖).現(xiàn)令線圈以恒定的速度v沿垂直于磁場區(qū)域邊界的方向穿過磁場區(qū)域.取沿a→b→c→d→a的感應(yīng)電流方向為正,則在線圈穿越磁場區(qū)域的過程中,感應(yīng)電流I隨時間t變化的圖線可能是(  )                                                                                                                 

                                                                                                            

  A.                                        B.  C.       D.    

                                                                                                                                     

查看答案和解析>>

科目:高中物理 來源: 題型:


如圖所示,水平放置的平行金屬導(dǎo)軌,相距L=0.50m,左端接一電阻R=0.20Ω,磁感應(yīng)強(qiáng)度B=0.40T的勻強(qiáng)磁場方向垂直于導(dǎo)軌平面,導(dǎo)體棒ab垂直放在導(dǎo)軌上,并能無摩擦地沿導(dǎo)軌滑動,導(dǎo)軌和導(dǎo)體棒的電阻均可忽略不計,當(dāng)ab以v=4.0m/s的速度水平向右勻速滑動時,求:                                                                                 

(1)ab棒中感應(yīng)電動勢的大小,并指出a、b哪端電勢高?                                          

(2)回路中感應(yīng)電流的大;                                                                                      

(3)維持ab棒做勻速運(yùn)動的水平外力F的大。ㄕf明:計算時可認(rèn)為導(dǎo)體棒ab長為L=0.50m)                           

                                                                                              

                                                                                                                                     

查看答案和解析>>

科目:高中物理 來源: 題型:


如圖所示,物塊M在靜止的足夠長的傳送帶上以速度v勻速下滑時,傳送帶突然啟動,方向如圖中箭頭所示,若傳送帶的速度大小也為v,則傳送啟動后(                                )                                        

                                                                                                

    A.  M下滑的速度不變

    B.  M靜止在傳送帶上

    C.  M先向下減速運(yùn)動,后向上加速,最后與傳送帶一起向上運(yùn)動

    D.  M可能沿斜面向上運(yùn)動

                                                                                                                               

查看答案和解析>>

同步練習(xí)冊答案