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Graphite or "graphite paste" is used for electrodes because a) it is conductive b) it is inexpensive c)  it can continuously expose a "fresh" surface.  I'm not sure if you want to call brushes for motors "electrodes" but, for that purpose, carbon's low coefficient of friction is a plus.
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mark as brainliest ans i hope it help u
Bcoz it is a good conductor of electricity...
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