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Unformatted text preview: Name: Section: QUIZ #5 Physics 222, Fall 2011 Sep. 27, 2011 Version A Two parallel long wires are 10.0 cm apart and carry currents I and 3 I , respectively, flowing at the same direction. At what distance from each of the two wires the total magnetic field is zero? Solution d x 3 I B 2 I B 1 We need a point where both fields are equal in magnitude and opposite in directions. In all points to the left of the Iwire, both fields are pointing upward. Both will point downward to the right of the 3 Iwire. So, it is only possible to have zero field in between the two wires. Let’s denote the distance between the zerofield point and the Iwire as x and the distance between the two wires as d . So: B 1 = B 2 μ I 2 πx = μ (3 I ) 2 π ( d x ) ⇒ 1 x = 3 d x Solving for x x = d 4 = 2.5 cm So the field is zero between the two wires, 2.5 cm from the Iwire and 7.5 cm from the 3 Iwire. Name: Section: QUIZ #5 Physics 222, Fall 2011 Sep. 27, 2011 Version B Two parallel long wires are 6.0 cm apart and carry currents I and 3 I , respectively, flowing at opposite directions. At what distance from each of the two wires the total magnetic field is zero?directions....
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This note was uploaded on 11/14/2011 for the course PHYS 5863005 taught by Professor Meyer during the Fall '09 term at Iowa State.
 Fall '09
 MEYER

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