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Part A The electric field must be zero inside a conductor in electrostatic equilibrium, but not inside an insulator. It turns out that we can still apply Gauss's law to a Gaussian surface that is entirely within an insulator What is the electric field strength at a point inside the insulation that is 1.6 mm from the axis of the wire? by replacing the right-hand side of Gauss's law, Qin/ED, with Qin/E , where & is the permittivity of the material. (Technically, co is called the vacuum ? permittivity.) Suppose a long, straight wire with linear charge density 250 nC/m is covered with insulation whose permittivity is 2.5co. N E- 1.12 . 1012 C Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining