Consider the three-dimensional conductor in the figure, that has a hole in the center. The conductor has an excess charge 7.2 μC on it. What is the electric flux (in N⋅m2/C) through the Gaussian surface S1 shown in the figure?   Now put a point of charge 27.4 μC inside the cavity of the conductor. What is the flux (in N⋅m2/C) through the Gaussian surface S1?  Now consider the Gaussian surface S2. With the charge still inside the cavity, what is the flux (in Nm2/C) through this surface?

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.