In Milkan's oil drop experiment, a charged oil drop of density 880 kg m-3 is held stationary between two parallel plates 6 mm apart with a potential difference of 103 V. When the electric field is switched off, the dropis observed to fall a distance of 2 mm in 35.7 sec. How many extra electrons does it carry ? (Assume viscosity of air = 1.8 X 10-5 Ns m-2 ; density of air = 1.29 kgm-3)1) 5 2) 4 3) 3 4) 2

Shane Macguire , 11 Years ago

Grade upto college level