Question

which of these two circuirs A or B shows the correct obs ervation ?​

Answer 1

Answer:

This circuit depicts the Potato test for proving that some fruits and vegetables conduct electricity.

A potato is cut into two halves and the copper wires of a tester are inserted into it. After half an hour, it was noticed that there was a greenish blue spot on the potato around one wire whereas there was no such spot around the other wire. They found that it was always the wire connected to the positive terminal, which had a greenish blue spot around it. This concept could be used for identifying the positive terminal of a cell or a battery concealed in a box.