Fill in the blank.
The metal caps of the carbon rods wrapped with copper wires and joined with a battery are known as [[1]].

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answer is ELECTRODES.

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Detailed Solution

Electrodes are carbon rods with a metal cap wrapped on the top of the rod.

Electrodes are used in different battery types, electroplating and electrolysis, welding, cathodic protection, membrane electrode assembly, and chemical analysis.

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