Multiple choice

If we cut out a piece of potato and insert copper wire of a tester into it, what effect will be observed?

  1. A red spot is formed on one terminal of the wire.

  2. A greenish-blue spot is formed on one terminal of the wire.

  3. A bluish-black spot is formed on one terminal of the wire.

  4. A greenish-blue spot is formed on both terminals of the wire.

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A greenish-blue spot is formed on one terminal of the wire and that terminal is the positive terminal.