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Question

A bird perches on a power line that carries a current of 160 A. Calculate the potential difference between the bird's feet if the resistance of the wire is 10μΩm1 and the bird's feet are 4 cm apart?


  1. 1.6 x 10-5 V

  2. 6.4 x 10-5 V

  3. 3.2 x 10-5 V

  4. 9.6 x 10-5 V


Solution

The correct option is B

6.4 x 10-5 V


The resistance of 4 cm of wire is R=0.04×10×106=4×107Ω. The potential difference across 4 cm of wire is thus,
V=IR=160×4×107=6.4×105V=64μV.

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