Question

Q 21:

The dielectric strength of air is 3×106V/m. As you walk across a synthetic rug, your body accumulates electric charge, causing a potential difference of 9000 V between your body and a doorknob.

Estimate the distance between you and the doorknob at which the spark will jump.

Q 22:

A lightning flash occurs when -45 C of charge moves from a cloud to Earth through a potential difference of 4.3 ×10^8 V

Determine how much water can boil (including the water that will vaporize) as a result of energy released during the process. Assume that all the energy goes to heating the water from an initial temperature of Ti = 20 C∘. The specific heat of water is 4180 J/kg⋅∘C and the latent heat of vaporization is 2.256×10^6J/kg

Answer 1