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Why Birds don't get electric shock while sitting on transmission lines?

Current flows in a loop (which means the circuit is closed). A bird sitting on a transmission line does not complete the circuit. If the same bird keeps one leg on one track and another leg (or any part of its body) on another line(or the neutral points), then it will get roasted. Consider this circuit where a bird sits on the wire: The values R1 and R2 are resistances of the line. Electricity takes the path of least resistance. The two legs...

 
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