1. The problem statement, all variables and given/known data Thin rod AB has length L=100 cm and total charge q0=37 nC that is distributed in such a way that its line density [itex]\lambda[/itex] is proportional to the square of the distance from the end A, i.e. [itex]\lambda[/itex](x) =kx^2. Determine electric field E at the end A of the rod. 2. Relevant equations E = (1/(4pi[itex]\epsilon[/itex]0)) Electric Field for a thin uniformly charged conducting wire: E = [itex]\lambda[/itex]/(2[itex]\pi[/itex]r[itex]\epsilon[/itex]0) 3. The attempt at a solution if [itex]\lambda[/itex](x) =kx^2 , can we find k by plugging in 1m in x and setting it equal to 37. meaning k is 37. Since they are asking for the E at point A, is x just 0? and does that mean that E is 0?