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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 = 4t3 + 6t + 6,
where t is in seconds.
(a) What is the instantaneous current through the surface at t = 0.900
s?
A
(b) What is the value of the current density?
KA/m2

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