专题五 带电粒子在电场中运动的综合问题
专题五带电粒子在电场中运动的综合问题返回返回立足立足““四翼四翼””探考点探考点聚焦聚焦““关键关键””提素能提素能课时跟踪检测课时跟踪检测返回返回立足“四翼”探考立足“四翼”探考点点返回返回考点一示波管的工作原理[素养自修类]【对点训练】1．[示波管的原理分析](多选)如图所示是示波器的原理示意图，电子经电压为U1的加速电场加速后，进入电压为U2的偏转电场，离开偏转电场后打在荧光屏上的P点。P点与O点的距离叫偏转距离。要提高示波器的灵敏度(即单位偏转电压U2引起的偏转距离)，下列办法中可行的是()返回返回A．提高加速电压U1B．增加偏转极板a、b的长度C．增大偏转极板与荧光屏的距离D．减小偏...
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