Question

The quantity of charge Q in coulombs (C) that has passed through a point in a...

The quantity of charge Q in coulombs (C) that has passed through a point in a wire up to time t (measured in seconds) is given by

Q(t) = t3− 4t2 + 6t + 1.

[See this example. The unit of current is an ampere 1 A = 1 C/s.]

(a) Find the current when t = 0.7 s.
A

(b) Find the current when t = 1 s.
A

At what time is the current the lowest?
t =  s

Math   Calculus   
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