A 8.0 m ordinary lamp extension cord carries a 6.0 A current. Such a cord typica

Question

A 8.0 m ordinary lamp extension cord carries a 6.0 A current. Such a cord typically consists of two parallel wires carrying equal currents in opposite directions. Part A Find the magnitude of the force that the two segments of this cord exert on each other. (You will need to inspect an actual lamp cord at home and measure or reasonably estimate the quantities needed to do this calculation.) Express your answer in newtons to one significant figure View Available Hint(s) SubmitPre Previous Answers X Incorrect, Try Again; 3 attempts remaining Part B Find the direction (attractive or repulsive) of the force that the two segments of this cord exert on each other. Match the words in the left column to the appropriate blanks in the sentences on the right. Reset Help the same direction attract opposite directions repel Because the currents are in , the wires Submit Request Answer Provide Feedback Next >

Explanation / Answer

(A) Estimated distance between two wire = 2.5 mm

F = u0 I1 I2 L / (2 pi d )

F = (4 pi x 10^-7)(6^2)(8) / (2 x pi x 2.5 x 10^-3)

F = 0.02 N ....Ans

(B) Because the currents are in " opposite directions", the wire " repel" .

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