Divide the circumference of the earth by (2x3.14) and that's roughly the answer.
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Oil drillers drill in the earth to find oils and gases submitted in the earth.
a pebble is something you find on the earth
OK, well Earth Loop Tester have a permanent magnet in it. When we rotate it, the flux cut the the conductor and consequently an emf is produced. As we connect the two point of the tester to the earth it complete the circuit and current start flowing through it. The ratio of voltage and current give us the Impedance of Earth.
Many places sell robots, There are many different types of robots and complexity. They can be found in toy stores and hobby shops.
A 6 mm earth wire can be used to replace a 2.5 mm earth wire, but if there is an existing 6 mm earth wire it must be 6 mm all the way to the earth, and not replaced by a smaller wire between it and the earth connection.