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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


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


Grade:upto college level

1 Answers

Abhishek Kumar
askIITians Faculty 255 Points
9 years ago
Initially, F = neE = mg
E = Vd
Also,
u=0
a = g – 6\pi \eta rv/m (Viscous force is in opposite direction)
s = 0.002 m
t= 35.7 s
Solve the two equations.

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