Question

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

The current is defined as:

$I=\frac{Q}{t}$

Plugging the values given and solving for t we have that:

$\begin{gathered} 5\times10^{-3}=\frac{2}{t} \\ t=\frac{2}{5\times10^{-3}} \\ t=400 \end{gathered}$

Therefore it will take 400 seconds.