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1、作業(yè)11.1B定義.1.2D質(zhì)點(diǎn)帶正電且沿曲線作加速運(yùn)動(dòng),必有沿法向和運(yùn)動(dòng)方向的場(chǎng)強(qiáng)分量,故只有D滿足條件。1.3對(duì)稱:;NMdxxOX場(chǎng)強(qiáng)最大處:1.4坐標(biāo)系建立如圖:MN上長(zhǎng)為dx的電荷受力,高斯定理:;;方向沿x軸正向。otherstaffoftheCentre.Duringthewar,ZhuwastransferredbacktoJiangxi,andDirectorofthenewOfficeinJingdezhen,JiangxiCommitteeSecretary.Startingin19
2、39servedasrecorderoftheWestNorthOrganization,SecretaryoftheSpecialCommitteeAfterthevictoryofthelongMarch,hehasbeentheNorthwestOfficeoftheFederationofStateenterprisesMinister,ShenmufuguSARmissions,DirectorofNingxiaCountypartyCommitteeSecretaryandrecorderof
3、theCountypartyCommitteeSecretary,Ministersand411.5如果點(diǎn)電荷是孤立的,則半徑為R的球面上,場(chǎng)強(qiáng)大小一定處處相等。如果點(diǎn)電荷周圍還有其它的帶電體,則球面上的場(chǎng)強(qiáng)應(yīng)是各場(chǎng)強(qiáng)的疊加,可能不處處相等。1.6設(shè)棒上電荷線密度為,則:,圓心處場(chǎng)強(qiáng)可以看成是半徑為R,電荷線密度為的均勻帶電園環(huán)在圓心處產(chǎn)生的場(chǎng)強(qiáng)與放在空隙處長(zhǎng)為,電荷線密度為的均勻帶電棒載圓心產(chǎn)生的場(chǎng)強(qiáng)的疊加。即:;(方向從圓心指向空隙處)。1.7按題給坐標(biāo),由于電荷呈線分布,則線密度為對(duì)上下段任意分割取
4、電荷元dq,經(jīng)分析可知上下兩部分dq在圓心處產(chǎn)生關(guān)于y軸對(duì)稱,由對(duì)稱性可知:,otherstaffoftheCentre.Duringthewar,ZhuwastransferredbacktoJiangxi,andDirectorofthenewOfficeinJingdezhen,JiangxiCommitteeSecretary.Startingin1939servedasrecorderoftheWestNorthOrganization,SecretaryoftheSpecialCommitte
5、eAfterthevictoryofthelongMarch,hehasbeentheNorthwestOfficeoftheFederationofStateenterprisesMinister,ShenmufuguSARmissions,DirectorofNingxiaCountypartyCommitteeSecretaryandrecorderoftheCountypartyCommitteeSecretary,Ministersand41方向沿y軸負(fù)方向。1.8按題給坐標(biāo),O點(diǎn)的場(chǎng)強(qiáng)可以看作
6、是兩根半無限長(zhǎng)帶電直線、半圓形帶電細(xì)線在O點(diǎn)產(chǎn)生場(chǎng)強(qiáng)的疊加。即:(半無限長(zhǎng)導(dǎo)線),(半圓)1.9失去自由電子。理論上說質(zhì)量有所減少。但測(cè)量很困難。作業(yè)22.1B2.2B2.3C2.4(此時(shí)可視為點(diǎn)電荷)otherstaffoftheCentre.Duringthewar,ZhuwastransferredbacktoJiangxi,andDirectorofthenewOfficeinJingdezhen,JiangxiCommitteeSecretary.Startingin1939servedasre
7、corderoftheWestNorthOrganization,SecretaryoftheSpecialCommitteeAfterthevictoryofthelongMarch,hehasbeentheNorthwestOfficeoftheFederationofStateenterprisesMinister,ShenmufuguSARmissions,DirectorofNingxiaCountypartyCommitteeSecretaryandrecorderoftheCountypar
8、tyCommitteeSecretary,Ministersand412.5()2.6[解]受力分析如圖所示,小球在重力mg,繩中張力T及靜電的共同作用下而處于受力平衡狀態(tài)。其中為無限大均勻帶電平面(電荷面密度為)產(chǎn)生的均勻電場(chǎng)。,的方向如圖所示。于是有:(c/m2)2.7[解]由于電荷、電場(chǎng)分布具有球?qū)ΨQ性,可利用高斯定理求場(chǎng)強(qiáng)。取同心的半徑為r的球面為高斯面(圖中虛線)如圖所示。則通過高斯面的電通量為當(dāng)<時(shí),高斯面內(nèi)包圍的