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The circuit in the figure below consists of wires at the top and bottom and identical metal springs in the left and right sides. The upper portion of the circuit is fixed. The wire at the bottom has a mass of 10.0 g and is 5.00 cm long. The springs stretch 0.460 cm under the weight of the wire, and the circuit has a total resistance of 12.0 . When a magnetic field is turned on, directed out of the page, the springs stretch an additional 0.320 cm. What is the magnitude of the magnetic field?

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