1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Find an expression for the electric field(Mastering Physics)

  1. Jan 21, 2015 #1
    I just wanted to post a solution for anyone interested. Any notes on how to solve would be nice for others.

    1. The problem statement, all variables and given/known data

    Mastering Physics (3rd edition) Problem 26.40

    The figure (Figure 1) shows a thin rod of length L with total charge Q.
    Part A) Find an expression for the electric field strength on the axis of the rod at distance r from the center.

    Part B) Verify that your expression has the expected behavior if r≫L.
    Express your answer in terms of variables Q, rand constants π, ε0.

    Part C) Evaluate E at r = 3.6cm if L = 5.0 cm and 2.2nC .
    Express your answer to two significant figures and include the appropriate units.

    3. The solution
    Part A)
    Part B)
    Part C)
  2. jcsd
  3. Jan 22, 2015 #2

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper

    It is usually more help to post the method for obtaining solutions, the reasoning etc., rather than the bare answer as you have done here.
    Why are those the correct answers? How would someone figure those out for themselves?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted