The quantity of charge q (in coulombs) that passes through a cross section of a wire varies with time according to the equation q(t) = 5(1-e-4t) μC. What is the (instantaneous) current through the cross section at t=0s?
a. -15 μA
b. +5 μA
c. +20 μA
d. -20 μA
e. +25 μA
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