21. + -14 points SCalc8 4.4.048 My Notes Ask Your Teacher A current exists whene

Question

21. + -14 points SCalc8 4.4.048 My Notes Ask Your Teacher A current exists whenever electric charges move. IfAQ is the net charge that passes through a surface during a time period , then the average current during this time interval is defined as average current- AQ. 92- Q1 = ao- If we take the limit of this average current over smaller and smaller time intervals, we get what is called the current I at a given time t Thus the current is the rate at which charge flows through a surface. The current in a wire is defined as the derivative of the charge: I(t) - Q'(t). What doesI(t) dt represent? It represents the change in the charge Q from time t = a to t = b. It represents the change in the current 1 from time t = a to t = b. It represents the charge Q at time t. It represents the current I at time t. Submit Answer Save Progress Home My Assignments Extension Request WebAssign8 4.0 1997-2017 Advanced Instructional Systems, Inc. All rights reserved

Explanation / Answer

I(t)=Q'(t)

integrating both sides

Q(t)=integration of I(t) from a to b

It means the integration represents change in current from a to b.

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