Question 3
A person standing barefoot on the ground touches a live wire and is shocked. Why, when the bird was not?
The right answer is the one marked above.
Because there is a potential difference between the wire and the ground. The person’s two contact points are the wire and the earth, which are at very different potentials, so a closed circuit is formed and current passes through the body to the ground.
Everything else about the two situations is the same. The only change is where the second contact point is — and it is the whole difference.