1. The problem statement, all variables and given/known data A researcher would like to perform an experiment in zero magnetic field, which means that the field of the earth must be cancelled. Suppose the experiment is done inside a solenoid of diameter 1.0 m, length 4.0 m, with a total of 5000 turns of wire. The solenoid is oriented to produce a field that opposes and exactly cancels the field of the earth. What current is needed in the solenoid’s wires? 2. Relevant equations ∑B ∆length = (µ0)I 3. The attempt at a solution B = 5 * 10^-5 T length = 4 m radius = 0.5 m i = [4*(5*10^-5)]/(5000*2*pie*0.5) i = 1.27*10^-8 have i done this correctly at all?!?!