<p><span style=\"font-family: CMR10;\"> <p>Two charges are located along the</p>

Question

<p><span>
<p>Two charges are located along the</p>
</span></p>
<p><span>x</span><span>-axis. One</span></p>
<p><span><br />
<p>has a charge of 6</p>
</span><span>.</span><span>4 </span><span>&#956;</span><span>C, and the second has a</span></p>
<p><span><br />
<p>charge of</p>
</span></p>
<p><span>&#8722;</span><span>3</span><span>.</span><span>4 </span><span>&#956;</span><span>C.</span></p>
<p><span><br />
<p>If the electrical potential energy associ-</p>
<br />
<p>ated with the pair of charges is</p>
</span></p>
<p><span>&#8722;</span><span>0</span><span>.</span><span>049 J,</span></p>
<p><span><br />
<p>what is the distance between the charges?</p>
<br />
<p>The value of the Coulomb constant is</p>
<br />
<p>8</p>
</span></p>
<p><span>.</span><span>98756 </span><span>&#215; </span><span>10</span><span><span>9 </span></span><span>N </span><span>&#183; </span><span>m</span><span><span>2</span></span><span>/</span><span>C</span><span><span>2 </span></span><span>, </span><span>and the accelera-</span></p>
<p><span><br />
<p>tion due to gravity is 9</p>
</span></p>
<p><span>.</span><span>81 m</span><span>/</span><span>s</span><span><span>2 </span></span><span>.</span></p>
<p><span><br /></span><span>
<p>Answer in units of m</p>
</span></p>

Explanation / Answer

Two charges are located along the

x-axis. One

has a charge of 6

.4 C, and the second has a charge of -3.4 C. If the electrical potential energy associ- ated with the pair of charges is0.049 J,

what is the distance between the charges?

-0.049 = 9e9 * 6.4e-6 * -3.4e-6 / d

d = 3.99 m

The value of the Coulomb constant is

8

.98756 × 109 N · m2/C2 , and the accelera-

tion due to gravity is 9

.81 m/s2 .

Answer in units of m

-0.049 = 9e9 * 6.4e-6 * -3.4e-6 / d

d = 3.99 m

The value of the Coulomb constant is

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