Question

Practice 1. If the current in a wire of a CD player is 5.00 mA, how long would it take for 2.00 C of charge to pass through a cross-sectional area of this wire?

Answer 1

`T=4*10^2s`

Step-by-step explanation: The time needed for the 2.00C charge to pass at a current of 5.00mA is:

`I=5.00mA=5.00*10^(-3)\rightarrow I=5.00*10^(-3)(C)/(s)`

Therefore time is:

`\begin{gathered} T=(Q)/(I)=(2C)/((5.00*10^(-3)(C)/(s)))=(2)/(5)*10^3s \\ \therefore\Rightarrow \\ T=0.4*10^3s=4*10^2s \\ T=4*10^2s \end{gathered}`

Note! Q is for charge and I is for current