The Resistivity of Nichrome at 20ºC Is 100 $\times$ 10^-8 $\Omega$ · MYou Have Nichrome Wire Whose Diameter Is 2

question 71

Multiple Choice

The resistivity of nichrome at 20ºC is 100 $\times$ 10^-8 $\Omega$ · m.You have nichrome wire whose diameter is 2.50 mm and need a resistance of 100 $\Omega$ .How long would a piece of this wire need to be to provide this resistance?

• A)196 m
• B)491 m
• C)543 m
• D)867 m
• E)1.96 km