Question 5
Why is touching a wire with a hand wet with sweat far more dangerous than with clean dry skin?
The right answer is the one marked above.
Sweat is rich in salts and conducts well, so the resistance falls. Skin is the part of the body offering the greatest resistance. Wetting it with a good conductor lowers that resistance, and by I = V ÷ R a lower resistance means a larger current.
The voltage has not changed at all. What changed is you — which is why the body’s resistance is not a fixed number and varies from person to person and with time.