<div style="margin: 0px; padding: 0px; color: #404040; font-family: gulim, sans-serif; font-size: 13px; line-height: 22px">"반지름이 a와 b인 두 공심 공껍질을 생각하자. 안쪽 껍질에는 전하 q가, 바깥쪽 껍질에는 전하 -q가 있다고 하자(둘 다 껍질에 고르게 퍼져 있다). 이 전하 배열의 에너지를 구하라"</div> <div style="margin: 0px; padding: 0px; color: #404040; font-family: gulim, sans-serif; font-size: 13px; line-height: 22px"><br style="margin: 0px; padding: 0px" /></div> <div style="margin: 0px; padding: 0px; color: #404040; font-family: gulim, sans-serif; font-size: 13px; line-height: 22px">그리고 문제에서는 <img name="img_19c52120acd29f74e588730b50a7df2e" alt="" src="http://kinimage.naver.net/20130920_21/1379681156971hOzVC_JPEG/8183799_1379681156.jpg?type=w620" align="middle" equation="%7B%22meta%22%3A%5B%220%2C0%2Cffffff%2C110%22%5D%2C%22latex%22%3A%22W%5C%5Cquad%20%3D%5C%5Cquad%20%5C%5Cfrac%20%7B%20%5C%5Ccombi%20_%7B%200%20%7D%7B%20%5C%5CE%20%20%7D%20%7D%7B%202%20%7D%5C%5Cint%20_%7B%20%5C%5Cquad%20%20%7D%5E%7B%20%5C%5Cquad%20%20%7D%7B%20%5C%5Ccombi%20%5E%7B%202%20%7D%7B%20E%20%7D%5C%5Cquad%20d%5C%5Ctau%20%20%7D%20%22%2C%22scale%22%3A%221%22%7D" order="1" style="margin: 0px; padding: 0px; border: 0px" /> 이 식을 이용하라고 되있어요. 그러니 E를 구해야겠죠.</div> <div style="margin: 0px; padding: 0px; color: #404040; font-family: gulim, sans-serif; font-size: 13px; line-height: 22px"><br style="margin: 0px; padding: 0px" /></div> <div style="margin: 0px; padding: 0px; color: #404040; font-family: gulim, sans-serif; font-size: 13px; line-height: 22px"><span style="margin: 0px; padding: 0px; line-height: 1.5">저런 유형의 경우 일반적인 경우라면 가우스 법칙을 사용하여 전기장을 구하잖아요.</span></div> <div style="margin: 0px; padding: 0px; color: #404040; font-family: gulim, sans-serif; font-size: 13px; line-height: 22px"><br style="margin: 0px; padding: 0px" /></div> <div style="margin: 0px; padding: 0px; color: #404040; font-family: gulim, sans-serif; font-size: 13px; line-height: 22px"><img name="img_e90447034a96a3161cbfa9a1db875e90" alt="" src="http://kinimage.naver.net/20130920_150/1379680949144LxWca_JPEG/0187086_1379680949.jpg?type=w620" align="middle" equation="%7B%22meta%22%3A%5B%220%2C0%2Cffffff%2C285%22%5D%2C%22latex%22%3A%22%5C%5Coint%20_%7B%20%5C%5Cquad%20%20%7D%5E%7B%20%5C%5Cquad%20%20%7D%7B%20E%5C%5Ccdot%20d%5C%5Coverrightarrow%20%7B%20a%20%7D%20%7D%5C%5Cquad%20%3D%5C%5Cquad%20%5C%5Cfrac%20%7B%20%5C%5Crho%20%20%7D%7B%20%5C%5Ccombi%20_%7B%200%20%7D%7B%20%5C%5CE%20%20%7D%20%7D%5C%5C%5C%5C%20%5C%5C%5C%5C%20%5C%5CRightarrow%20%5C%5Cquad%20E%5C%5Ccdot%204%5C%5Cpi%20%5C%5Ccombi%20%5E%7B%202%20%7D%7B%20r%20%7D%5C%5Cquad%20%3D%5C%5Cquad%20%5C%5Cfrac%20%7B%201%20%7D%7B%20%5C%5Ccombi%20_%7B%200%20%7D%7B%20%5C%5CE%20%20%7D%20%7D%5C%5Ccombi%20%5E%7B%20%5C%5Cquad%20%20%7D%7B%20%5C%5Cint%20_%7B%20%5C%5Cquad%20%20%7D%5E%7B%20%5C%5Cquad%20%20%7D%7B%20%5C%5Crho%20%5C%5Cquad%20d%5C%5Ctau%20%20%7D%20%7D%20%22%2C%22scale%22%3A%221%22%7D" order="0" style="margin: 0px; padding: 0px; border: 0px" /><br style="margin: 0px; padding: 0px" /></div> <div style="margin: 0px; padding: 0px; color: #404040; font-family: gulim, sans-serif; font-size: 13px; line-height: 22px"><br style="margin: 0px; padding: 0px" /></div> <div style="margin: 0px; padding: 0px; color: #404040; font-family: gulim, sans-serif; font-size: 13px; line-height: 22px">r<a, a<r<b, r>b 세가지 경우를 나눠서 풀었겠죠.</div> <div style="margin: 0px; padding: 0px; color: #404040; font-family: gulim, sans-serif; font-size: 13px; line-height: 22px"><br style="margin: 0px; padding: 0px" /></div> <div style="margin: 0px; padding: 0px; color: #404040; font-family: gulim, sans-serif; font-size: 13px; line-height: 22px">하지만 이 문제의 경우는 점전하에서 나오는 전기장의 경우처럼</div> <div style="margin: 0px; padding: 0px; color: #404040; font-family: gulim, sans-serif; font-size: 13px; line-height: 22px"><br style="margin: 0px; padding: 0px" /></div> <div style="margin: 0px; padding: 0px; color: #404040; font-family: gulim, sans-serif; font-size: 13px; line-height: 22px"><img name="img_31489ae2ae33d684271999ad7a078f6c" class="_rolling_0" alt="" src="http://kinimage.naver.net/20130920_106/1379681082618mYn8t_JPEG/%C0%FC%C0%DA%B1%E2%C7%D0_2.36.JPG?type=w620" width="620" height="57" style="margin: 0px; padding: 0px; border: 0px; cursor: pointer" /> <br style="margin: 0px; padding: 0px" /></div> <div style="margin: 0px; padding: 0px; color: #404040; font-family: gulim, sans-serif; font-size: 13px; line-height: 22px">이런 식으로 했는데 이유를 알 수 있을까요?</div>
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