mape'rcent error calculation between the expected value for your slope (from :numer 5) and your experimental value for the slope (slope of your graph) _ Dr to" "- 7. ;;-.:."'_'._ hug-u- r Inn'- " J Part 2. Earth's Magnetic Field Smarlphones have magnetometers that measure the magnetic eld around the phone in three different directions x-yz. - On your smartphone download the app: "Physics Toolbox Sensor SuiteIl :- Open the app. Tap on the menu option( E ). This will open a list of tools a Select Magnetometer from the list. Set your phone on a table (move as far as possible from any other electronics) and let the graph form as the app collects data. 1. From the graph that forms, notice the red, green, and blue lines indicating the X, Y, and Z-axis respectively. a. Use the pause button to pause the readings at least 8 times (the more the better.) Each time you pause, record the values for the magnetic eld on the X,Y, and Z directions b. Take the average of your X, Y, and Z values. These are your best estimates for the X, Y, and Z components of Earth's magnetic eld