Problem 21.20 When a potential difference of 12 V is applied to a wire 6.7m long

Question

Problem 21.20

When a potential difference of 12 V is applied to a wire 6.7m long and 0.33mm in diameter the result is an electric current of 2.2A .

Part A

What is the resistivity of the wire?

Express your answer using two significant figures.

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Problem 21.20

When a potential difference of 12 V is applied to a wire 6.7m long and 0.33mm in diameter the result is an electric current of 2.2A .

Part A

What is the resistivity of the wire?

Express your answer using two significant figures.

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Explanation / Answer

V= IR

R = V/I

R = 12/2.2 = 5.45 Ohm

now resistivity (rho) = R x A/L = (5.45 x pi x (0.33 x 10-3/2)2 ) / 6.7 = 6.9 x 10-8

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