<span>Дано:</span><span>q=17,7нКл=17,7*10^-9Кл</span>
<span>S</span><span>=10</span><span>см</span><span>^</span><span>2=</span><span>0,001</span><span>м</span><span>^2</span>
<span>d=3,5</span><span>мм=0,0035м</span>
<em><span>ε</span></em><span>=</span><span>8</span>
<span>W-?</span>
<span>W=q^2/2C, C=</span><em><span> ε ε</span></em><span>oS/d, C=8*8,85*10^-12*0,001/0,0035=20,22*10^-12</span><span>Ф</span>
<span>W=</span><span>17,7</span><span>*10^-9</span><span>*17,7</span><span>*10^-9</span><span>/40,44</span><span>*10^-12</span><span>=7,7*10^-6Дж=7,7мкДж</span>