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云南省2024年中考试题猜想(YN)物理试卷答案试卷答案

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云南省2024年中考试题猜想(YN)物理试卷答案第一部分

15.(16分)如图所示为一种磁约束装置的原理图,同心圆圆心O与xOy平面坐标系原点重合.圆环内部存在垂直于纸面向里的匀强磁场(小圆内部区域无磁场).小圆四周上存在一可沿圆周右侧自由移动的粒子源A,粒子源与原点O的连线与y轴负方向成0角,该粒子源在不同位置均能沿x轴正方向发射速度为v0的带电粒子.已知小圆半径为R,匀强磁场的磁感应强度为B,带电粒子的质量为m、电量为q,且满足v0=qRBm,,粒子在运动过程中不与粒子源相碰,忽略粒子重力和磁场边缘效应.求:(1)带电粒子在磁场中做匀速圆周运动的半径R0,和周期T0;(2)若=90^时粒子能回到A点,求磁场的最小面积S和粒子第一次回到A点所经历的时间;(3)若粒子源可发射正、负两种粒子(质量、电量、初速度均和题干中粒子相同),要求粒子能以相同的速度回到A点,求θ满足的条件和第一次以相同的速度回到A所经历的时间.(

云南省2024年中考试题猜想(YN)物理试卷答案第二部分（待更新）

关于物体的内能,下列说法正确的是D0^C温度为0℃的物体没有内能B物体的内能增加,一定是通过外界对物体做功C.正在沸腾的水吸收热量,温度增加,内能不变D.在相同的物态下,同一物体的温度降低,它的内能会减少