It takes an electric eld of about 30 kV/cm to cause a
Chapter 16, Problem 16.67(choose chapter or problem)
It takes an electric eld of about 30 kV/cm to cause a spark in dry air. Shufe across a rug and reach toward a doorknob. By estimating the length of the spark, determine the electric potential difference that existed between your nger and the doorknob just before you touched the knob. Try this experiment again on a very humid day, and you will nd that the spark is much shorter or is imperceptible. Why?
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