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A student uses a potato as a cell to get electric current, and he finds some green spot on the potato when a copper wire is inserted. The green spot shows the

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Positive terminal

Negative terminal

Both positive and negative terminals

Can't be predicted

answer is B.

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Detailed Solution

Potato is a good conductor of electricity as it has salt and free ions in it. When we connect copper wires, which is a good conductor with potato, the circuit is complete.

A greenish blue spot appears in the point where the potato is connected to the positive terminal.

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