Question: An electric field E with an aver age magnitude of about 150 N/C points downward in the atmosphere near Earth's surface. We wish to float

An electric field E with an aver age magnitude of about 150 N/C points downward in the atmosphere near Earth's surface. We wish to "float" a sulfur sphere weighing 4.4 N in this field by charging the sphere.
(a) What charge (both sign and magnitude) must be used?
(b) Why is the experiment impractical?

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