The wires in a household lamp cord are typically 2.5 mm apart center to center a
ID: 1865849 • Letter: T
Question
The wires in a household lamp cord are typically 2.5 mm apart center to center and carry equal currents in opposite directions Part A If the cord carries current to a 100-W light bulb connected across a 120-V potential difference, what force per meter does each wire of the cord exert on the other? (Model the lamp cord as a very long straight wire.) Express your answer using two significant figures. F/L N/m Submit Request Answer Part B Is the force attractive or repulsive? attractive repulsive Submit Request Answer
Explanation / Answer
A) Current, I = 100/120 = 0.8333 A
Current will be in opposite directions in the two wires
Force per unit length, F = ?o ib ia /2?d
where ia is the current in one wire and ib in the other. In this case they are equal:
F = (1.2566 * 10^-6)(0.8333)2/(2?)(2.5 * 10^-3 m)
F = 5.55 x 10-5 N/m
B) It is repulsive (opposite directions)
C) No, it is negligible
Comment in case any doubt please rate my answer....
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.