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The electric field of the earth is on average 1 5 0 ???? ???? downward at 1 0 . 0 ???? above the surface. If

The electric field of the earth is on average $150 \frac{????}{????}$ downward at $10.0 ????$ above the surface. If the earth is modelled as a uniform infinite planar charged object, what is its surface charge density, $???? ?$

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