生成视频---**Question Header:**
13. (2024 • 广东省惠州中学高二期中)
**Problem Description:**
如图真空中有一等边三角形 ABC, 边长 d=0.30 m。
在 A 点固定一电荷量 q₁ = + 1.0 × 10⁻⁶ C 的点电荷, 静电力常量 k=9.0 × 10⁹ N • m²/C²。
**Diagram Description:**
Type: Geometric figure (Triangle)
Main Elements:
- Three points labeled A, B, and C, forming the vertices of a triangle.
- Dashed lines connect points A and B, B and C, and C and A, indicating the sides of the triangle.
- Point A is located to the right of point B. Point C is located above points A and B.
- A positive point charge is located at point A, labeled as q₁ and indicated by a circle with a "+" sign inside.
- The triangle is described as equilateral.
**Sub-question (1):**
求点电荷 q₁ 产生的电场在 C 处的电场强度 E₁ 大小;
**Sub-question (2):**
在 B 点固定另一个 q₂ = -1.0 × 10⁻⁶ C 的点电荷, 求 C 处合电场强度 E 的大小及方向。