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 + 7t + 4. (a) Find the current when t = 0.7 s. (b) Find the current when t = 1 s. At what time is the current the lowest? t =

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 + 7t + 4. (a) Find the current when t = 0.7 s. (b) Find the current when t = 1 s. At what time is the current the lowest? t =

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter21: Current And Direct Current Circuits

Section: Chapter Questions

Problem 3P: The quantity of charge q (in coulombs) that has passed through a surface of area 2.00 cm2 varies...

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Question

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 + 7t + 4.
(a) Find the current when t = 0.7 s.
(b) Find the current when t = 1 s.
At what time is the current the lowest?
t =

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