A voltage V is connected across a wire of length L andradius r. How is the electron drift speed affected if (a) L isdoubled, (b) r is doubled, (c) V is doubled, assuming ineach case that other quantities stay the same?

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A voltage V is connected across a wire of length L and
radius r. How is the electron drift speed affected if (a) L is
doubled, (b) r is doubled, (c) V is doubled, assuming in
each case that other quantities stay the same? 

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