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The quantity of charge q (in coulombs) that has passed through a surface of area 1.90 cm varies with time according to the equation q

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The quantity of charge q (in coulombs) that has passed through a surface of area 1.90 cm varies with time according to the equation q = Bc + 6t + 6, where t is in seconds. (a) What Is the Instantaneous current through the surface at t = 0.950 57 (b) What is the value of the current density? KA/m

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