Question

A bird perches on a bare high-power line, and nothing happens to the bird. a man standing on the ground touches the same line and gets a fatal shock. why?

Answer 1

Hey friend!!
It's a common phenomenon. The birds body acts as an insulator because there is no other body which the bird touches to pass the electric current. Hence it does not gets a shock.
Whereas a man acts as a conductor to transfer the current from the line to the Earth and gets a fatal shock.
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Answer 2

when a bird is perched on a bare high power line , the circuit does not get completed between the earth and the bird , therefore nothing happens to the bird .

when a man standing on ground touches the same line, the circuit between the man and the earth gets completed. As a result, he gets a fatal shock.