Find electric field a distance P from a charged rod

  • #1

Homework Statement


The figure below shows a thin, vertical rod of length L with total charge Q. The indicated point P is a horizontal distance x from the one end of the rod. What is the electric field at point P. Express your answer in component notation in the two blanks below.

L = 5.0 cm, Q = 3.0 nC, and x = 3.0 cm.


physs2.jpg


Homework Equations


kq/r^2

The Attempt at a Solution


theta = arctan(5/3) = 59 deg
total charge = [(8.99x10^9)(3x10^-9)]/((0.03)^2) = 29966
x component = 29966cos59=15417

1.8/2 points
 

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Answers and Replies

  • #3
Why am I only getting 1.8/2 points for 15417N/C??? is something incorrect?
 
  • #8
SammyS
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Homework Statement


The figure below shows a thin, vertical rod of length L with total charge Q. The indicated point P is a horizontal distance x from the one end of the rod. What is the electric field at point P. Express your answer in component notation in the two blanks below.

L = 5.0 cm, Q = 3.0 nC, and x = 3.0 cm.


View attachment 230884

Homework Equations


kq/r^2

The Attempt at a Solution


theta = arctan(5/3) = 59 deg
total charge = [(8.99x10^9)(3x10^-9)]/((0.03)^2) = 29966
x component = 29966cos59=15417

1.8/2 points
This working of this problem is incorrect.
 

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