simple electrostatics question.

Test Preparation AP Test Preparation
1

<p>A charge of +20 uC comes in contact with a -10 uC charge. What is the magnitude of each charge after contact?</p>

<p>the battery of a car delivers of 50A for 2s to start a car. how many coulombs of charge move through the starter during this 2 seconds?</p>

2

<ol>
<li>well, you add +20 and -10 and then you divide by 2:</li>
</ol>

<p>(+20±10)/2= +10/2= +5uC on each one.</p>

<ol>
<li>Current is the change in charge over the change in time. So, I=Q/t</li>
</ol>

<p>so 50A=Q/2s Q=(50A)(2s)=100C.</p>