Question

the terminals A and Bof a copper wire are inserted into a piece of potato connected to a battery .what will be the colour of region of potato wire connected to positive terminal of battery?

Answer 1

Potato Battery:

the terminals A and Bof a copper wire are inserted into a piece of potato connected to a battery.
Potato contains starch which undergoes electrolysis and by this process more electrons are produced.
The electrons move from negative terminal to positive terminal and react with copper wire and form blue greenish spot.

Answer 2

there is greenish blue spot present near the positive terminal