Answer: A straight wire of mass 10.0 g and length 5.0 cm
Chapter , Problem 74(choose chapter or problem)
A straight wire of mass 10.0 g and length 5.0 cm is suspendedfrom two identical springs that, in turn, forma closed circuit (Fig. P19.74). The springs stretch a distanceof 0.50 cm under the weight of the wire. The circuithas a total resistance of 12 V. When a magneticfield directed out of the page (indicated by the dots inthe figure) is turned on, the springs are observed tostretch an additional 0.30 cm. What is the strength ofthe magnetic field? (The upper portion of the circuit isfixed.)
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