Part A Find the resistance of a 1.3 m length of gold wire with diameter 4.5×10 5

Question

Part A

Find the resistance of a 1.3 m length of gold wire with diameter 4.5×105 m .

Express your answer to two significant figures and include the appropriate units.

Part B

Find the resistance of a 1.3 m length of gold wire with diameter 6.0×104 m .

Express your answer to two significant figures and include the appropriate units.

Part C

Find the resistance of a 1.3 m length of gold wire with diameter 5×103 m .

Express your answer to one significant figure and include the appropriate units.

R3 =

Explanation / Answer

(a) resistance = resistivity*length/area

R1 = 2.44*10^-8*1.3/(3.14*5.06*10^-10) = 19.97ohm

(b) R2 = 2.44*10^-8*1.3/(3.14*36*10^-8/4) = 0.11ohm

(c) R3 = 2.44*10^-8*1.3/(3.14*25*10^-6/4) = 0.16*10^-2ohm

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