You are helping to design a new electron microscope to investigate thestructure of the HIV virus. A new device to position the electron beamconsists of a charged circle of conductor. This circle is divided into twohalf circles separated by a thin insulator so that half of the circle can becharged positively and half can be charged negatively. The electronbeam will go through the center of the circle. Your task is to completethe design by calculating the electric field in the center of the circle as afunction of the amount of positive charge on the half circle, the amountof negative charge on the half circle, and the radius of the circle.

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