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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 I-wire, both fields are pointing upward. Both will point downward to the right of the 3 I-wire. So, it is only possible to have zero field in between the two wires. Let’s denote the distance between the zero-field point and the I-wire 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 I-wire and 7.5 cm from the 3 I-wire. 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