The quantity of charge q in coulombs c that has passed


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) = t2 - 2t2 + 4t + 5.

Find the current when t= 0.4s.

Find the current when t= 1 s.

At what time is the current the lowest?

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Mathematics: The quantity of charge q in coulombs c that has passed
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