15问答网 > 大学物理电学、10-18、10-19、求具体步骤

大学物理电学、10-18、10-19、求具体步骤

2025-04-07 01:03:11
推荐回答（1个）
回答1：

18、做简单定积分 电荷发布密度为: ρ=q/R/α 依据对称性，微元电荷产生的电场向对称轴投影。 dE=dq/(4πεR²)*cos(θ) =ρ*Rdθ/(4πεR²)*cosθ =q/R/α*Rdθ*cosθ/(4πεR²) =q/(4πεR²α)*cosθdθ E=∫(-α/2,α/2)dE =q/(4πεR²α)*2sin大学物理电学、10-18、10-19、求具体步骤

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