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Here are 6 links that will show you some of the data Google has about you. 1. Find out what Google thinks about you In order to serve relevant ads, Google collects data about you and creates a profile. Google also has a tool called Google Analytics, that helps publishers see what pages you have viewed on their website, how many times you have visited it, how long did you stay etc.
Thermocouples Made From Ordinary Copper and Steel Wire. Thermocouple loop made into a coil can deflect a compass needle.
DC current probe meters are certainly not found everywhere but a compass can be used to indicate current flow by making the thermocouple loop into a coil. This coil uses 5 feet of copper wire but the use of 12 gauge keeps the resistance low enough for observable current to flow. The compass needle is most easily deflected when it is perpendicular to the coil axis as shown in the above picture. A piece of tissue paper was placed over the mirror in the compass case to eliminate lighting glare while taking the photographs. A flame held under one junction will cause an easily observable deflection of the compass needle. When a flame is held under the opposite junction, the compass needle will deflect in the opposite direction. The magnetic field of the earth pulls on the compass needle like a spring and makes it somewhat difficult to deflect.
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