v Section 3; Measure B Field Using Lorentz Force We can compare the measurement of the magnetic field strength using the concept of Lorentz Force. In the video below, the same magnetic gap assembly from the previous video is placed on a scale to measure the force caused by current flowing through a conductor immersed in the gap. Alt Text: In the video below, we see the magnetic gap wire a copper wire running through it on top of a scale. The copper wire has one black wire grounding it to a metal/wooden structure and has one red wire connected to a machine that controls the current. There is an Einstein on top of the machine. A hand appears and turns on the scale and the current machine. The current starts at zero but is slowly increased by turning a knob on the machine. The scale changes readings when the current changes. 88.8 8.8.8 15 139 . 1683 2 4294 0 Nay1. Make a graph of Lorentz Force, F subscript mag, vs current, IIII, in amps. Use this graph, along with other quantities you can measure from the video, to determine the magnetic flux density, B, in the gap. Current Scale reading Force (F= mg) A variable variable N variable 1 0 42 0.00 2 1.3 43 0.0302 3 2.9 43.06 0.0673 4 7.8 43.27 0.180 5 11.4 43.42 0.263 6 15 43.57 0.344 18.4 43.72 0.421 8 26.4 44.06 0.599 9 29.5 44.19 0.668 10 33.9 44.38 0.764Force Vs Current v 0.8 0.7 0.6 0.5 0.4 Force (F= mg) (N) 0.3 0.2 0.1 5 10 15 20 25 30 35 Current (A) Display Curve Fit Uncertainties Force (F= mg) Curve: y = Ax + B A : 0.0226 + 0.0000713 - B : 0.00292 + 0.00133 N RMSE : 0.00260 N r : 1.002. Find the magnetic field strength B? Hint: The magnitude of the Lorentz force is: Force equals current times length times magnetic field