Problema Resuelto 7 (1).pdf

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Problema resuelto 7 Una varilla de longitud L tiene una carga positiva por unidad de longitud y una carga total Q. Determine el campo elΓ©ctrico y el potencial en el punto P a lo largo del eje de la varilla, a una distancia b de un extremo. SOLUCIΓ“N: El cΓ‘lculo del campo se obtiene de

𝑑𝑑𝑑𝑑 = 𝐾𝐾

𝑑𝑑𝑑𝑑 πœ†πœ†πœ†πœ†πœ†πœ† = 𝐾𝐾 π‘₯π‘₯ π‘₯π‘₯

𝑉𝑉 = οΏ½ 𝑑𝑑𝑑𝑑 = πΎπΎπœ†πœ† οΏ½

𝑏𝑏+𝐿𝐿

𝑏𝑏

𝑑𝑑𝑑𝑑 π‘₯π‘₯

= πΎπΎπœ†πœ†[ln(𝑏𝑏 + 𝐿𝐿) βˆ’ 𝑙𝑙𝑙𝑙𝑙𝑙] = πΎπΎπœ†πœ†πœ†πœ†πœ†πœ† οΏ½

El cΓ‘lculo del campo se obtiene de: 𝑑𝑑𝑑𝑑 = 𝐾𝐾

𝑑𝑑𝑑𝑑 πœ†πœ†πœ†πœ†πœ†πœ† = 𝐾𝐾 2 2 π‘₯π‘₯ π‘₯π‘₯

𝐸𝐸 = οΏ½ 𝑑𝑑𝑑𝑑 = πΎπΎπœ†πœ† οΏ½ 1 𝑏𝑏+𝐿𝐿 = πΎπΎπœ†πœ† οΏ½βˆ’ οΏ½ π‘₯π‘₯ 𝑏𝑏 = πΎπΎπœ†πœ† οΏ½βˆ’

𝑏𝑏

1 1 + οΏ½ 𝑏𝑏 + 𝐿𝐿 𝑏𝑏

𝐿𝐿 οΏ½ = πΎπΎπœ†πœ† οΏ½ 𝑏𝑏(𝑏𝑏 + 𝐿𝐿)

=

𝑏𝑏+𝐿𝐿

𝐾𝐾𝐾𝐾 𝑏𝑏(𝑏𝑏 + 𝐿𝐿)

𝑑𝑑𝑑𝑑 π‘₯π‘₯ 2

𝑏𝑏 + 𝐿𝐿 οΏ½ 𝑏𝑏

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