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</a> 在真空中，與點電荷Q相距r的M點放一個帶負(fù)電的試探電荷q，此時試探電荷受到的電場力大小為F，方向如圖所示。則（　?。?p style="text-align:justify;"><img src="http://tikupic.21cnjy.com/ct20241o/26/4c/264c9d94ac11d3d3b2f6562a0d7f8d60.png" width="173" height="85" style="max-width:100%;"></p> </h1> <div id="zrdfxl3" class="exam-s"> <span id="jp317nz" class="op-item"><span id="z91rxnb" class="op-item-nut">A . </span><span id="xfptnnt" class="op-item-meat">點電荷Q帶的是負(fù)電荷</span></span> <span id="lpjlrjh" class="op-item"><span id="tfjhpb5" class="op-item-nut">B . </span><span id="vp1hnh1" class="op-item-meat">M點的場強(qiáng)大小為<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmi%3Ek%3C%2Fmi%3E%3Cmfrac%3E%3Cmi%3Eq%3C%2Fmi%3E%3Cmrow%3E%3Cmsup%3E%3Cmi%3Er%3C%2Fmi%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmsup%3E%3C%2Fmrow%3E%3C%2Fmfrac%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"></span></span> <span id="l9hz3lb" class="op-item"><span id="pfrjlln" class="op-item-nut">C . </span><span id="vbpljb7" class="op-item-meat">M點的場強(qiáng)方向與F的方向相同</span></span> <span id="3dhh3jt" class="op-item"><span id="bthtvp1" class="op-item-nut">D . </span><span id="vbbvn9z" class="op-item-meat">取走試探電荷q，M點場強(qiáng)變?yōu)榱?/span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="7zx5rrx" id="J_ConnectQuestionsdBox"> </div> </div> </div> <div id="n53djzz" class="g-sd2">  <div style="background:#fff;padding:20px 0;margin-bottom:20px;text-align:center;"> <img src="/question/paper-qrcode?id=58578892" 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="h51jnbn" class="analyize-extend JV_question__papers"> <h3 class="extend-mt">使用過本題的試卷</h3> <ul class="extend-mc"> <li> <a href="/paper/view-5391561.shtml" target="_blank" title="高考物理一輪復(fù)習(xí)：帶電粒子在電場中的運動" class="ex-tit"> 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