Electric Field

Core Sentence / 核心句

Electric field is force per unit positive test charge.

中文理解：电场把“某个具体电荷受到的力”除掉试探电荷量，留下空间本身的作用背景。

Formula / 公式或规则

$$\vec{E}=\frac{\vec{F}}{q}$$

For a point charge:

$$E=k\frac{|Q|}{r^2}$$

When To Use / 什么时候用

看到 force per charge、field direction、test charge，就回到 electric field 定义。

Watch Out / 易错点

电场是 vector；不要只加大小。

Search and Source Mentions / 搜索与出现位置

Mentioned In / 出现位置

• AP电磁学第1次正课-电荷库仑定律与电场 · Knowledge Point 12: Electric Field Is Force per Unit Positive Test Charge
  • Knowledge Point 12: Electric Field Is Force per Unit Positive Test Charge
• AP电磁学第1次正课-电荷库仑定律与电场 · Knowledge Point 13: Electric Field of a Point Charge
  • Knowledge Point 13: Electric Field of a Point Charge
• AP电磁学第1次正课-电荷库仑定律与电场 · Knowledge Point 14: Direction of Electric Field Uses a Positive Test Charge
  • Knowledge Point 14: Direction of Electric Field Uses a Positive Test Charge
• AP电磁学第1次正课-电荷库仑定律与电场 · Knowledge Point 15: Uniform Electric Field Acts Like Constant Acceleration
  • Knowledge Point 15: Uniform Electric Field Acts Like Constant Acceleration
• AP电磁学第2次正课-连续带电体电场与电通量 · Example: Where Can the Electric Field Be Zero?
  • Example: Where Can the Electric Field Be Zero?
• AP电磁学第1次正课-电荷库仑定律与电场 · Acceleration in a Uniform Electric Field
  • Acceleration in a Uniform Electric Field
• AP电磁学第1次正课-电荷库仑定律与电场 · Electric Field
  • Electric Field
• AP电磁学第1次正课-电荷库仑定律与电场 · Force in an Electric Field
  • Force in an Electric Field
• 第11次正课 · electric and magnetic force
• 第11次正课 · velocity selector

Connected Notes / 连接

• AP电磁学第1次正课-电荷库仑定律与电场
• AP电磁学第2次正课-连续带电体电场与电通量
• AP电磁学第11次正课-磁场洛伦兹力与带电粒子运动
• Lorentz Force
• Hall Effect
• Test Charge
• Electric Field Lines
• Electric Field Superposition