The quantity of charge q (in coulombs) that has passed through a surface of area 1.90 cm2 varies with time according to the equation q = 8t3 + 8t + 6, where t is in seconds.
(a) What is the instantaneous current through the surface at t = 1.05 s?
A
(b) What is the value of the current density?
kA/m2