A high tension wire is at a high potential with respect to a wire which is well grounded called Earth wire. You must have seen such wires stretched parallel to roads. There is a high tension wire between two points $A$ and $B .1 \mathrm{~km}$ apart. The distance between HT wire and earth wire is 1 $\mathrm{m}$. The resisatnce of the HT (and also the earth wire) is $1 \Omega / \mathrm{m}$. This wire is at a potential of 11 $\mathrm{KV}$ at point $A$ w.r.t. to earth wire. and its is carrying $1 \mathrm{~A}$ current which returns back to the generator by through the earth wire. This wire is quite a thick wire. There is a sign board at a pole over which this wire is stretched reading DANGER, $11 \mathrm{KV}$. You might thick what would happen if one touched this wire. Will one feel a shock or not. Well! it depends on whether the current through our body exceeds a particular valuem which we may call CRITICAL CURRENT.Consider a bird having effective resistance \( 10 \Omega \) between its feet sitting on this high tension wire. The distance between its feet is \( 10 \mathrm{~cm} \). The potential difference between the feet of the bird is approximately.
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