Question

Bhoojo took some grains of boiled rice in test tube A and Paheli took salty water in test tube B. Both of them poured 1-2drops of iodine solution into the test tube. In which test tube will they observe blue -black colour change? Why?

Answer 1

Answer:

Thus to collect a charge of one coulomb, from a body from which 109 electrons move out every second, we will need approximately 200 years.