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A thin glass rod of length ?has a linear charge density that is constant along the...

A thin glass rod of length ?has a linear charge density that is constant along the length of the rod. a)What is the electric potential on a charge q at a distance h above the middle of the rod? b) Using the answer from part (a), find the field very far from the rod (when h>>?). c) Using the answer from part (a), find the field very close to the rod (when h<<?).

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