如圖所示,在正交的勻強(qiáng)電場(chǎng)和磁場(chǎng)的區(qū)域內(nèi)(磁場(chǎng)水平向內(nèi)),有一離子恰能沿直線(xiàn)飛過(guò)此區(qū)域(不計(jì)離子重力)(   )                                                                                                                           

                                                                                                   

    A.  不管離子帶何種電,E方向都向下

    B.  若增大離子電量,離子將向上偏轉(zhuǎn)

    C.  若增大離子電量,離子將向下偏轉(zhuǎn)

    D.  若增大離子電量,離子不偏轉(zhuǎn)繼續(xù)沿直線(xiàn)飛過(guò)

                                                                                                                                  

練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目:高中物理 來(lái)源: 題型:


如圖是利用閃光照相研究平拋運(yùn)動(dòng)的示意圖.小球A由斜槽滾下,從桌邊緣水平拋出,當(dāng)它恰好離開(kāi)桌邊緣時(shí),小球B也同時(shí)下落,閃光頻率為10Hz的閃光器拍攝的照片中B球有四個(gè)像,像間距離已在圖中標(biāo)出,單位為cm,如圖所示,兩球恰在位置4相碰.                                           則A球離開(kāi)桌面時(shí)的速度         m/s,重力加速度大小為                m/s2

                                                                                  

                                                                                                                                

查看答案和解析>>

科目:高中物理 來(lái)源: 題型:


如圖所示,PQ為一固定水平放置的光滑細(xì)長(zhǎng)桿,質(zhì)量均為m的兩小球A、B穿于其上,兩球被穿于桿上的輕彈簧相連.在A、B兩球上還系有長(zhǎng)度為2L的輕線(xiàn),在輕線(xiàn)中間系有質(zhì)量不計(jì)的光滑定滑輪E, C、D球質(zhì)量分別為m和2m,用輕繩連接并跨過(guò)定滑輪。釋放C、D后,當(dāng)C、D球運(yùn)動(dòng)時(shí)輕彈簧長(zhǎng)度也為L(zhǎng),已知?jiǎng)哦认禂?shù)為K,(彈簧在彈性限度內(nèi),重力加速度為g)求

(1)C、D球運(yùn)動(dòng)時(shí),連接C、D的輕繩中張力T

(2)求細(xì)桿對(duì)A球的彈力FA大小

(3)求彈簧的原始長(zhǎng)度?

查看答案和解析>>

科目:高中物理 來(lái)源: 題型:


如圖所示,光滑圓弧的半徑為0.2m,有一質(zhì)量為1.0kg的物體自A點(diǎn)由靜止開(kāi)始下滑到達(dá)B點(diǎn),然后物體沿粗糙水平面繼續(xù)向前最遠(yuǎn)能夠到達(dá)C處,已知B到C的距離為1m.求:(g=10m/s2)                                                   

(1)物體到達(dá)B點(diǎn)時(shí)的速率;                                                                                        

(2)物體與水平面間的動(dòng)摩擦因數(shù).                                                                              

                                                                                          

                                                                                                                                       

查看答案和解析>>

科目:高中物理 來(lái)源: 題型:


如圖所示的電路中,R1、R2均為定值電阻,R3為可變電阻,電源的電動(dòng)勢(shì)為E,內(nèi)阻為r.設(shè)理想電流表A的讀數(shù)為I,理想電壓表V的讀數(shù)為U.當(dāng)R3滑動(dòng)觸頭向圖中a端移動(dòng)時(shí)(  )                         

                                                                                               

    A. I變大,U變小                 B. I變大,U變大    C.      I變小,U變大      D. I變小,U變小

                                                                                                                                  

查看答案和解析>>

科目:高中物理 來(lái)源: 題型:


如圖所示,電源電動(dòng)勢(shì)E=10V,內(nèi)阻r=0.5Ω,“8V,16W”的燈泡恰好能正常發(fā)光,電動(dòng)機(jī)M繞組的電阻R0=1Ω,求:                                                                                                                             

(1)燈泡的電流I1;                                                                                                 

(2)電源的總電流I;                                                                                              

(3)電動(dòng)機(jī)的總功率P1;                                                                                         

(4)電動(dòng)機(jī)的熱功率P2和電動(dòng)機(jī)的機(jī)械功率P3.                                                     

                                                                                         

                                                                                                                                  

查看答案和解析>>

科目:高中物理 來(lái)源: 題型:


如圖甲所示,100匝的線(xiàn)圈,橫截面積是0.1m2,線(xiàn)圈兩端A、B與一個(gè)理想電壓表相連.線(xiàn)圈中有垂直紙面向里的磁場(chǎng),磁場(chǎng)的磁感應(yīng)強(qiáng)度按圖乙所示規(guī)律變化,則(                                                  )            

                                                           

    A. 電壓表的示數(shù)是2V                 B. 電壓表的示數(shù)是2.5V

    C. A點(diǎn)電勢(shì)高于B點(diǎn)                   D.    B點(diǎn)電勢(shì)高于A點(diǎn)

                                                                                                                                       

查看答案和解析>>

科目:高中物理 來(lái)源: 題型:


下列說(shuō)法中正確的是(     )                                                                                      

    A.  只有體積很小或質(zhì)量很小的物體才可以看作質(zhì)點(diǎn)

    B.  在單向直線(xiàn)運(yùn)動(dòng)中,物體的位移就是路程

    C.  有摩擦力一定有彈力

    D.  物體受到的幾個(gè)共點(diǎn)力的合力一定大于每一個(gè)分力

                                                                                                                                       

查看答案和解析>>

科目:高中物理 來(lái)源: 題型:


人造衛(wèi)星繞地球做勻速圓周運(yùn)動(dòng),對(duì)其線(xiàn)速度下列說(shuō)法中正確的是(              )                              

    A. 一定等于7.9km/s  B. 等于或小于7.9km/s

    C. 一定大于7.9km/s  D.  介于7.9km/s~11.2km/s

                                                                                                                                     

查看答案和解析>>

同步練習(xí)冊(cè)答案