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Calculation of the electric field of finite uniformly charged cylinder with excavated a small cylinder by using the idea of polygon approximation

WANG Jia-le(Department of Physics,South University of Science and Technology,Shenzhen,Guangdong 518000,China)  
According to the formula of the electric field due to finite unifomfly charged line and the superposition of electric field,this article gives a new method to calculate the electric field of finite uniformly charged cylinder with excavated a small cylinder,(in vacuum) which is easier,faster and more definite than the method using elliptical integral.Furthermore,discussion and simulation of the cases that arbitrary number of small cylinders are excavated are presented.
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