11:r. LTE VIVA session s.com Item 3 MasteringPhysics Item 3 A 3.00-m length of c

Question

11:r. LTE VIVA session s.com Item 3 MasteringPhysics Item 3 A 3.00-m length of copper wire at 20 °C has a 1.20-m-long section with diameter 1.4 mm and a 1.80-m-long section with diameter 0.70 mm. There is a current of 3.0 mA in the 1.4 mm -diameter section. Part A What is the current in the 0.70 mm -diameter section? Express your answer using two significant figures. 123.0 mA Submit Give Up Correct Part B What is the magnitude of E in Express your answer using two significant figures. the 1.4 mm -diameter section? 3.25 10-5 V/m Submit Give Up Incorrect; Try Again

Explanation / Answer

B] electric field E= V/d = iR/L = i*rho/A = 3e-3*1.72e-8/(pi*1.4e-3^2/4) = 0.0000335 V/m

if rounded to two significant figure E = 0.000034 V/m

D] V = E1*L1 + E2*L2

= 0.0000335*1.2 + 0.00013408*1.8

= 0.00028 V

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