Step 1:

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The number of electrons are $\"\"$ .

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The drift speed is $\"\"$ .

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The time is $\"\"$ .

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The electron number density of silver is $\"\"$ .

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The number of charge carriers in a volume element is $\"\"$ .

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$\"\"$ .

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The circular cross sectional area is $\"\"$ .

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$ .

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Find the diameter of the wire.

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$\"\"$

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$\"\"$ .

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Substitute $\"\"$ , $\"\"$ , $\"\"$ and $\"\"$ in $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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The diameter of the wire is $\"\"$ .