An aluminum bar 3.76 m long has a rectangular cross section 1.35 cm by 5.07 cm .

Question

An aluminum bar 3.76 m long has a rectangular cross section 1.35 cm by 5.07 cm . What is resistance?What is the length of a copper wire 1.51 mm in diameter having the same resistance?

Item 9 Constants Part A An aluminum bar 3.76 m long has a rectangular cross section 1.35 cm by 5.07 cm What is its resistance? Submit Previous Answers Request Answer Incorrect, Try Again; 4 attempts remaining Part B What is the length of a copper wire 1.51 mm in diameter having the same resistance? L= In Submit Reguest Answer Provide Feedback

Explanation / Answer

R=pl/A =2.65×10-8 ×3.76/(1.35×5.07×10-4)

Calculating R=1.4557×10-4 Ohm.

B. Area of copper wire A=pi×r2

A=1.789 ×10-6.m^2

Resistivity of cupper p=1.68×10-8

R=pl/A

l=R×A/p . =1.4557×10^-4 ×1.789×10^-6/1.68×10^-8

l=1.55 cm.

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