What must be the diameter of a cylindrical 120-m long metal wire if its resistance is to be 6.0 ω? the resistivity of this metal is 1.68 × 10-8 ω ∙ m?

The resistance of the cylindrical wire is .

Here is the resistance, is the length of the wire and is the area of cross section. Since the wire is cylindrical . Rearranging the above equation,

Here .

Substituting numerical values,

Te diameter of the wire is

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beta is electron from nucleus

something from nucleus has changed, but charge must be same for cons of charge