y and measure the current with a digital multimeter. Allow the compass needle to settle and note the angle of deflection. FB Increase the current in steps by increasing the voltage on the power supply and record the angle of deflection in Table 1. G 7 x 10 = 0.07m Table 1. 14 = 7cm 2 N = 500 [turns], r = [m] Voltage, Current, [A] Angle of deflection tan a 1.5 20 0.36 3.0 3. 00 3 A 35 0. 70 4.5 0 .0 0 4A 46 4031.04 6.0 0. 005 A 540 1. 38 9.0 D. OO 8A 63 1 . 96 12.0 D.ONIA 68" 2 15 2.48 Turn off the power supply. Calculate the tangents of the angles you recorded and plot a graph of the tangents against the current values on a piece of graphing paper. Does the shape of your graph confirm a linear relationship between the current and the tangent of the angle of deflection?Part 2 determine. Increase the current until the needle deflection is as close to 450 as you can Record the current value in Table 2 and turn off the power supply. Reverse the connections to the coil and repeat the measurement. Average your current measurements. Table 2. Measurement #1 Measurement #2 Average Current (A) 0 . 004 A 0 . 004 A 10 . 004 A Calculate the value of Bearth using the formulas provided in theoretical explanation and compare it to 2.0 x 10-5 [T] which is the accepted truth value for the southern California. Bearth = I MON 1 = 2r Bearth tan Ox tand x 2r B = HON B = 2 L I X HO X N = Bearth VL arx tan Bearth = I MON Bearin = I MON tan d x 2r tand 2r K ar Bearth 0.0 0 4 x 4 x x 10 * 50 0 HON = 1 795 x 10 's tan ( 45 ) x 2 x 0. Omg Bearth= 0 . 004 x 4 x X 10 - x 500 tan ( 45 ) x 2 x 0 . 07 1048 x 10 - 5 = 108 x 10 - 5 T 2.0 x 10 -3 - 1. 8 x 10 "5 x 100 2.0 * 10 'S 2 . 0 x 10 - 1. 8 * 10 - 5 = 10 %% 2.0 * 10-5 10 1 0