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Physics, 22.07.2020 18:01 DragonLovely

The quantity of charge q (in coulombs) that has passed through a surface of area 2.05 cm2 varies with time according to the equation q = 5t3 + 6t + 6, where t is in seconds. (a) What is the instantaneous current through the surface at t = 0.96 s?
A
(b) What is the value of the current density?
kA/m2

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