2. A slinky is stretched so that there is a gap of 0.95cm between each loop. The magnetic field at the center of the slinky is measured for a range of currents and a graph is plotted of B (in milli-Tesla) versus current I (in Amperes). The result is a straight line with a slope of 0.14 mT/A and an intercept of 0.024 mT. Determine the value of u from this result.
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