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The estimation of the electric field in simple situations provides anopportunity to develop intuition about the models used in physics. We proposean activity aimed at university students of General Physics where the electricfield of a finite line of charge is compared, analytically or numerically, withthe fields of an infinite line and of a point charge. Contrary to intuition, itis not necessary to get very close for the line charge to be consideredinfinite, nor to move very far away for the finite line field to resemble thatof a point charge. We conducted this activity with a group of students andfound that many of them have not yet developed an adequate intuition about theapproximations used in electromagnetism.

How far away is infinity? An electromagnetic exercise to develop intuition regarding models