The average bulk resistivity of the human body (apart from the surface resistance of the skin) is about 5 Ω – m. The conducting path between the hands can be represented approximately as a cylinder 1.6 m long and 0.1 m diameter. The skin resistance may be made negligible by soaking the hands in salt water. A lethal shock current needed is 100 mA. Note that a small amount of potential difference could be fatal if the skin is damp.
(i) What is the resistance between the hands?
Text Solution
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Ans.
(i)
Sol. R = ρ 
= 
= 10 3 Ω
(ii)
Sol. V = IR = 100 × 10 –3 × 10 3 = 100 V
(iii)
Sol. P = VI = 10 W
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