I am in my senior year of school and I have been given a research task to do on the Earth's magnetic field in a given place. I have to come up with a full method for the experiment to perform in class in a week or so and then I need to use equations to create a discussion and show how I found the magnetic field using equations. My teacher has given me a pointers however. He said the experiment can be done using simply a compass, magnetic dip needle, power supply, connecting leads, resistors, ruler to measure distances and an ammeter to measure the current values. I have been researching to find methods and have found several but mostly they use equipment we don't have. So I could really use some help to create a method using the equipment listed above. Any ideas..?