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1. Consider the three-dimensional conductor in the figure, which has a hole in its interior. The conductor has an excess charge 1.7 μC on it.

2293_The three-dimensional conductor.png

a) What is the electric flux through the Gaussian surface S₁ shown in the figure?

b) Now put a point of charge 21.5 μC inside the cavity of the conductor. What is the flux sian surface S₁?

c) Now consider the Gaussian surface S₂. With the charge still inside the cavity, what is the flux through this surface?

2. Suppose a point charge creates a 7500 N/C electric field at a distance of 0.4 m.

a) What is the magnitude of the point charge in C?

b) How large is the field at 10 m in N/C?

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