[今日更新]江西省2023-2024学年度七年级阶段性练习（四）.物理试卷答案

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[今日更新]江西省2023-2024学年度七年级阶段性练习（四）.物理试卷答案试卷答案

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8.如图所示,水平天花板上的P、Q两点各固定一个光滑定滑轮,两根细绳跨过定滑轮分别连接A、B、C三个带电绝缘小球,三个小球保持静止状态且处于同一高度,定滑轮与小球在同一竖直面内。已知A、C球的质量均为m,B球的质量为M,△PAB、△QBC均为正三角形,重力加速度为g0。则A.A、B、C可能带同种电荷B.B球的电荷量最小C.M=2mD.A、B球之间库仑力大小为33mg

15.【拔高题】(15分)如图甲所示,边界线MN左侧空间I区域存在方向垂直纸面向里的匀强磁场,右侧空间Ⅱ区域存在一周期性变化的匀强电场,方向平行纸面且垂直MN边界,电场强度的变化规律如图乙所示(规定向左为电场的正方向)。一质量为m、带电荷量为+q的粒子,在t=0时刻从电场中A点由静止开始运动,粒子重m、+q力不计。t=0时刻从电场中A点释放的粒子经过5T恰好到达MN边界,假定磁5T场足够宽,粒子经过磁场偏转后又回到电场中,向右运动的最大距离和A点到E0、TMN的距离相等,图乙中E、T为已知量。求:(1)第一个周期T内粒子速度的增加量△v。(2)粒子到达MN时的动能Ek。(3)匀强磁场的磁感应强度大小B。

(2)为平衡摩擦力,下列操作正确的是(填序号).A.平衡摩擦力前,应将沙桶用细线绕过定滑轮系在小车上B.平衡摩擦力前,小车后面应固定一条纸带,纸带穿过打点计时器C.通过增减小车上的砝码改变质量时,不需要重新平衡摩擦力