Why the world isn't a big magnet:
1- The earth is not a big magnet. If it is, then it causes neurological problems on all human in the world.
2- Anything not stuck to the world.
Calculating the center and depth of the earth by using a compass.
Control: Using another compass far away to first compass.
For prove or debunk it somebody need to use a compass on the Antarctica. If it shows about horizontal then the earth has one magnetic pole on the center and there isn't another pole. If it shows the bottom ot the earth then;
If the earth has two magnetic poles and one of them is the "South Pole" ; or the earth is a sphere. Or there is another magnetic case we dont understand it.
Edit. Notice:
This theory depends on the force between charged particles. F= KQq/R^2
Here is;
F= Force
K= a constant
Q= charge of the earth
q= charge of the Compass bar
R= The distance between the center of the earth and the compass.
Test2:
I see that Bacgammon board has a few nails and these facts the measurement. So this test i used a wooden game board.
L= 15cm = 150mm
H= 3mm
R= 5.091 kms (From Istanbul to Geographic North)
h (center of the earth) = 3*5091 / 150 = 102 kms
H (depth of the earth) = 2*3*5091/150 = 204 kmsThis test isn't consistent with first . one of them is wrong.
probably this measurement is more accurate than first.
Test3:
Board is same board that used on test2
L= 15cm = 150mm
H= 2,5mm
R= 5.091 kms (From Istanbul to Geographic North)
h (center of the earth) = 2,5*5091 / 150 = 85 kms
H (depth of the earth) = 2*2,5*5091/150 = 170 kms