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session.masteringphysics.com Course Home MasteringPhysics: DC Crcuits Chegg Study I Guided Solutions a Chegg Study Guided Solutions Chegg Study Guided Solutions Chegg Study | Guided Solutions DC Circuits Problem 16.62 a previcus | 18 of 20 | next a Problem 16.62 Part A A bird stands on a 20,000-V bare copper power line. A 12-A current passes through the line. Determine the current through the bird. Assume the radius of the cross section of the (copper) wire be 1.0 cm, and the feet be separated by 6.6 cm. The resistivity of copper is 1.7 × 10-8 ·m. The resistance of the bird is 1000 Express your answer to two significant figures and include the appropriate units. hin 3.57.10A Submit My Answers Give Up Incorrect; Try Again; 2 attempts remaining Provide Feedback Continue

Explanation / Answer

length of the wire between the legs L1 = 6.6 cm = 0.066 m

resistance of wire between legs R1 = rho*L1/A

A = pi*r^2

r = radius of cross section of wire = 1 cm = 0.01 m

R1 = 1.7*10^-8*0.066/(pi*0.01^2)

R1 = 3.57*10^-6 ohms

Resistance of bird R2 = 1000 ohm

total resistane R = (R1*R2)/(R1+R2) = 3.57*10^-8 ohms

potential diference across the bird Vbird = Iwire*R = 12*3.57*10^-8 = 4.284*10^-5 V

current in the bird I = Vbird/Rbird = 4.284*10^-5/1000 = 4.284*10^-8 A <<<<--------ANSWER

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