Van de Graaf generator produces electric charge by rubbing a conveyor belt against a comb near the base and these charges are transferred and accumulated at the hollow metallic sphere at the top. If streamers are attached to the metal sphere, the streamers will be charged with the same sign of charge. These streamers will repel from each other and also from the sphere. The metal sphere has a very high potential because of the accumulated charges. If another grounded (0V) sphere is placed near to it, the potential difference can break down the air and electric arc will be formed. This phenomenon is very similar to thunder bolt found in nature. The existence of charges in the metal sphere can be demonstrated with an electroscope.
Негізгі бет Electric Charge
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