电子荷质比实验裝�?参数-价格-中国粉体罐�/title>

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} }); function showliuyan(me, showtype){ if(showtype==0){ //$("#Content").val($("#Content").attr('placeholder')); Content= document.getElementById('PopMsgFrom').Content.getAttribute('placeholder'); document.getElementById('PopMsgFrom').Content.value=Content; } if(showtype==1){ // $("#Content").val($(me).text()); alert($(me).text()); document.getElementById('PopMsgFrom').Content.value=$(me).text(); } $(".fxp").css("display","flex"); } function close_popwin(){ $(".fxp").css("display","none"); // 关闭虚拟电话后的留言� $(".dhxj").css("display","none"); $(".dhxjbox").css("display", "none"); $(".dhxjbox2").css("display", "none"); return false; } </script>  <div class="cpjs"> <div class="cpjs_tab"> <div class="js_cpjj" style="border-bottom: 3px solid #1479d7; color: #1479d7;">产品介绍</div> <div class="js_cxd">创新炸�/div> <div class="js_xgfa">相关方案</div> <div class="js_xgzl">相关资料</div> <div class="js_yhpl">用户评论</div> <div class="js_gsdt">公司动�?/div> <div class="js_wsj">问商宵�/div> </div> <script> $(function(){ // 切换 $(".cpjs_tab a").click(function(){ $(".cpjs_tab a").css({"color":"#4F5862","border-bottom-color":"transparent"}); $(this).css({"color":"#1479d7","border-bottom-color":"#1479d7"}); }); }); </script>  <div class="cpjj"> <p></p><p><span><strong><span>模块化设讠�/span></strong></span></p><p><span>电源带数字显示均可独立使用或其他实验，比如光电效应、核磁共振等、�/p><p>宽电压电源设计，可在110V�?20V之间切换，适用于大多数国家使用、�/p><p>亥姆霍兹线圈模块包含一对线圈和励磁电源，可改变的磁场大小，通用性强，可以做亥姆霍兹线圈等实验，应用更为广泛、�/span></p><p><span><strong><span>可选用 PASCO Capstone 软件对电子束作图像采集与分析</span></strong></span></p><p><span>可选用 PASCO Capstone 软件进行录制电子束在磁场作用下发生偏转的全过程，测量电子束形成封闭圆圈的半径，并通过公式编辑器计� e/m 或其它参数、�/span></p><p></p><p><span><strong><span>可旋转的汤姆逊管</span></strong></span></p><p></p><p><span>立式设计的汤姆逊灯管，更好的观察电子束的运动轨迸�/p><p>汤姆逊灯管可旋转 -45��~ +45��，学生可以通过旋转汤姆逊管，观察电子束在磁场中受不同方向洛伦兹力时� 电子束的偏转轨迹、�/span></p><p><span><strong><span>荧光标尺</span></strong></span></p><p><span>荧光标尺，即便在暗环境中也可观测电子束的位置与半径、�/span></p><p></p><p><span><strong><span>物理实验观察用暗箰�/span></strong></span></p><p><span>可为荷质比基座选配遮光暗箱� 使该实验不再受环境光的影响、�/span></p><p></p><p><span><strong><span>典型实验内容及数�?/span></strong></span></p><p><span>1. 观察电子束在磁场中的运动轨迹</span></p><p><span>在没有外加磁场的情况下，电子束的轨迹、�/span></p><p></p><p><span>在外加磁场与电子束出射方向垂直的情况下，电子束的轨迹是一个封闭的圆、�/span></p><p></p><p><span>在外加磁场与电子束出射方向不垂直的情况下，电子束的轨迹是一个螺旋线、�/span></p><p></p><p><span>2.计算电子的荷质比</span></p><p><span>R =158mm N = 130 匜�/p><p>B=(4/5)3/2 �� ��0? N ? IH / R</p><p>e/m=2U? (5/4)3? R2 / (N ? ��0 ? IH ? r) 2 ：�/p><p>e/m测量值与理论值之间的相对误差小于 5%、�/span></p><p><span><strong><span>部件列表</span></strong></span></p><p><span>BEM-5002 可调直流 (恒压) 电源II�?2V/100V/200V</span></p><div><p><span>BEM-5003 可调直流(恒流) 电源� 3.5A/6.3V</span></p><p><span>BEM-5017 电子荷质比基座，含亥姆霍兹线圈和镜面标尺</span></p><p><span>BEM-5703 电子束发射管</span></p><p><span><strong><span>选配仵�/span></strong></span></p><p><span>BEM-5226 物理实验观察用暗箰�/span></p><p><span>UI-5400 Capstone数据分析软件</span></p><p><span><strong><span>包装清单</span></strong></span></p><p><span>实验装置1套（详见部件清单）；电源�?根；红黑导线�?根；手册1�?/span></p></div> </div>  <div class="cxd"> <div class="cxd_tit"><span></span>创新炸�/div> <p style=" color: #333; font-size: 14px; margin: 10px 0 0; line-height: 26px;"> 暂无数据� </p> </div>  <div class="xgfa"> <div class="xgfa_tit"> <div> <span></span>相关方案 </div> </div> <div class="xgfa_box" style="display: block;"><div style="padding:10px;">暂无相关方案、�/div> </div> </div> <script> $(function(){ // 切换 $(".xgfa_tit_ul li").hover(function(){ $(".xgfa_tit_ul li").css({"color":"#4F5862","border-bottom-color":"transparent"}); $(this).css({"color":"#1479d7","border-bottom-color":"#1479d7"}); var _index = $(this).index(); $(".xgfa_box").css("display","none"); $(".xgfa_box").eq(_index).css("display","block"); }); }); </script>  <div class="xgzl"> <div class="cxd_tit"><span></span>相关资料</div> <div class="xgzl_box"><div style="padding:10px;">暂无数据、�/div> </div> </div>  <div class="yhpl"> <div class="cxd_tit"><span></span>用户评论</div> <form id="FormComments" action="" method="post" onsubmit="return false"> <input name="SaveProComments" id="SaveProComments" type="hidden" value="yes" /> <input name="ProductID" id="ProductID" type="hidden" value="253104" /> <input name="ProQuality" id="ProQuality" type="hidden" value="10" /> <input name="ProService" id="ProService" type="hidden" value="10" /> <input name="ProUsability" id="ProUsability" type="hidden" value="10" /> <input name="ProCostperformance" id="ProCostperformance" type="hidden" value="10" /> <div class="yhpl_pf"> <div> <p>产品质量</p> <div><span id="Quality" class="stars star10"></span><span id="Quality_Val" class="ScoreVal" curScore="10">10刅�/span></div> </div> <div> <p>售后服务</p> <div><span id="Service" class="stars star10"></span><span id="Service_Val" class="ScoreVal" curScore="10">10刅�/span></div> </div> <div> <p>易用�?/p> <div><span id="Usability" class="stars star10"></span><span id="Usability_Val" class="ScoreVal" curScore="10">10刅�/span></div> </div> <div> <p>性价毓�/p> <div><span id="Costperformance" class="stars star10"></span><span id="Costperformance_Val" class="ScoreVal" curScore="10">10刅�/span></div> </div> </div> <div class="yhpl_pftit">评论内容</div> <textarea name="Comments" id="ProComments" onfocus="checklogin();" placeholder="分享产品使用经验/采购评价（不超过500字）">