(1)粒子穿过界面时偏离中心线的距离以及速度大小?
(2)粒子到达界面时离点的距离为多少?
(3)设为延长线上的某一点,现在点固定一负点电荷(、间的区域仍无电场),使粒子穿过界面后恰好可以绕点做匀速圆周运动,求在点固定的负点电荷的电荷量为多少?(静电力常数,保留两位有效数字)
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2