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In this animation each charge represents a line or rod of charge extending into and out of the computer screen (position is given in centimeters and electric field strength is given in newtons/coulomb). Restart.

1. Explain how you know that the charge on the inner rod and the total charge on the outer cylinder are equal and opposite.
2. From the electric field measurements (read values when you drag the mouse on the screen), find the value of the charge per unit length, λ, as well as an expression for the electric field as a function of λ at any point. (The charge per unit length, λ, is the total charge Q divided by the length of the object L.)

Problem authored by Anne J. Cox.
Script authored by Wolfgang Christian.