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src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmn%3E2%3C%2Fmn%3E%3Cmn%3E7%3C%2Fmn%3E%3Cmi%3EQ%3C%2Fmi%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">和<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmn%3E6%3C%2Fmn%3E%3Cmn%3E4%3C%2Fmn%3E%3Cmi%3EQ%3C%2Fmi%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">的負(fù)點(diǎn)電荷。將小圓環(huán)從靠近N點(diǎn)處?kù)o止釋放，小圓環(huán)先后經(jīng)過(guò)圖上<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmsub%3E%3Cmrow%3E%3Cmi%3EP%3C%2Fmi%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E1%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsub%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">點(diǎn)和<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmsub%3E%3Cmrow%3E%3Cmi%3EP%3C%2Fmi%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsub%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">點(diǎn)，已知<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmn%3Es%3C%2Fmn%3E%3Cmn%3Ei%3C%2Fmn%3E%3Cmn%3En%3C%2Fmn%3E%3Cmtext%3E%CE%B8%3C%2Fmtext%3E%3Cmo%3E%3D%3C%2Fmo%3E%3Cmfrac%3E%3Cmrow%3E%3Cmn%3E3%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E5%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmfrac%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">則小圓環(huán)從<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmsub%3E%3Cmrow%3E%3Cmi%3EP%3C%2Fmi%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E1%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsub%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">點(diǎn)運(yùn)動(dòng)到<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmsub%3E%3Cmrow%3E%3Cmi%3EP%3C%2Fmi%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsub%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">點(diǎn)的過(guò)程中（　?。?p><img width="207" height="126" src="http://tikupic.21cnjy.com/2024/07/09/7b/3e/7b3eae4282b38e57fc8b6e55270945e0_239x146.png" style="max-width:100%;"></p> </h1> <div id="9mhlsxf" class="exam-s"> <span id="u3fc876" class="op-item"><span id="h3e2717" class="op-item-nut">A . </span><span id="dxg8al1" class="op-item-meat">靜電力做正功</span></span> <span id="nbfufvu" class="op-item"><span id="kasbn2h" class="op-item-nut">B . </span><span id="vzvms6r" class="op-item-meat">靜電力做負(fù)功</span></span> <span id="xlf6hiy" class="op-item"><span id="jcwv38x" class="op-item-nut">C . </span><span id="m7cbshh" class="op-item-meat">靜電力先做正功再做負(fù)功</span></span> <span id="vs2k8xl" class="op-item"><span id="994fp69" class="op-item-nut">D . </span><span id="j3g7aam" class="op-item-meat">靜電力先做負(fù)功再做正功</span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="7bmjz96" id="J_ConnectQuestionsdBox"> </div> </div> </div> <div id="f7pt89j" class="g-sd2">  <div style="background:#fff;padding:20px 0;margin-bottom:20px;text-align:center;"> <img src="/question/paper-qrcode?id=57818164" width="140px" height="140px" alt=""> <p style="text-align:center;margin-top: 10px">微信掃碼預(yù)覽、分享更方便</p> </div> <div id="5w116ng" class="analyize-extend JV_question__papers"> <h3 class="extend-mt">使用過(guò)本題的試卷</h3> <ul class="extend-mc"> <li> <a href="/paper/view-5391537.shtml" target="_blank" title="高考物理一輪復(fù)習(xí)：電勢(shì)能和電勢(shì)" class="ex-tit"> <b></b><span>高考物理一輪復(fù)習(xí)：電勢(shì)能和電勢(shì)</span> </a> </li> <li> <a 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