- #1
motyapa
- 4
- 0
Consider a total charge of q = 3.50
10^-9 C spread uniformly over a thin rod of length L = 0.8 m as shown. Point P is a distance H = 0.6 m away from the midpoint of the rod. Find the magnitude of the electric field at point P.
Relevant equations:
[tex] E = k \int \lambda dx/r^2 [/tex] where
[tex] \lambda = q/L [/tex] and
[tex] r = \sqrt{x^2 + H^2} [/tex]
Attempt at solution
[tex] E = k \int_{-.4}^{.4} \lambda dx/r^2 [/tex]
[tex] E = k \int_{-.4}^{.4} q dx/(L)(x^2 + H^2) [/tex]
[tex] E = (kq/L) \int_{-.4}^{.4} dx/(x^2 + H^2) [/tex]
[tex] E = (kq/L) \arctan(x/H) |^.4 _{-.4} [/tex]
plugging in k = 9 x 10^9, q = 3.5 x 10^-9, L = .8, H = .6 I get 46.3 N/C but this is incorrect.
Relevant equations:
[tex] E = k \int \lambda dx/r^2 [/tex] where
[tex] \lambda = q/L [/tex] and
[tex] r = \sqrt{x^2 + H^2} [/tex]
Attempt at solution
[tex] E = k \int_{-.4}^{.4} \lambda dx/r^2 [/tex]
[tex] E = k \int_{-.4}^{.4} q dx/(L)(x^2 + H^2) [/tex]
[tex] E = (kq/L) \int_{-.4}^{.4} dx/(x^2 + H^2) [/tex]
[tex] E = (kq/L) \arctan(x/H) |^.4 _{-.4} [/tex]
plugging in k = 9 x 10^9, q = 3.5 x 10^-9, L = .8, H = .6 I get 46.3 N/C but this is incorrect.