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矢量三角形法则由平行四边形法则演变而来,用于矢量运算.用矢量三角形求矢量的最小值,既简便又直观.例1 质量为 m 的带正电小球悬挂在绝缘细线上,其电荷量为 q,且处于匀强电场中.当小球静止时,细线与竖直方向成30°角,如图1所示,求电场强度 E 的最小值及其方向.分析由于小球受重力、电场力
The vector triangle rule evolves from the parallelogram rule and is used for vector operations. It is simple and intuitive to use the vector triangle to find the minimum value of the vector. Example 1 A positively charged ball of mass m is suspended on an insulated wire with its charge. The quantity is q and it is in a uniform electric field. When the ball is at rest, the thin line makes an angle of 30° with the vertical direction, as shown in Fig. 1. Find the minimum value and direction of the electric field strength E. Analyze due to the ball Gravity, electric force