The coherer effect | Science Project

The coherer effect or “Branly effect” is an electrical conduction instability which appears in a slightly oxi- dized metallic powder under a constraint. The ini- tially high powder resistance irreversibly falls by several orders of magnitude as soon as an electromagnetic wave is produced in its vicinity
The experiment is very simple but the results are very impressive. Iron powder and aluminum balls placed inside the pet cup are very high resistance. So, the current could not complete the path. Howewer, when the circuit was exposed to electromagnetic waves, the resistance was falling and the electric current passes through the circuit.
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