Question 129: Properties of Matter

Question

In Millikan's oil drop experiment, what is viscous force acting on an uncharged drop of radius 2.0 $	imes$ 10
$-$5
m and density 1.2 $	imes$ 10
3
kgm
$-$3
? Take viscosity of liquid = 1.8 $	imes$ 10
$-$5
Nsm
$-$2
. (Neglect buoyancy due to air).

Accepted Answer

Viscous force = Weight
$ = ho  	imes \left( {{4 \over 3}\pi {r^3}} ight)g$
= 3.9 $	imes$ 10
$-$10

Answer

3.8 $	imes$ 10
$-$11
N

Answer

3.9 $	imes$ 10
$-$10
N

Answer

1.8 $	imes$ 10
$-$10
N

Answer

5.8 $	imes$ 10
$-$10
N

Properties of Matter

In Millikan's oil drop experiment, what is viscous force acting on an uncharged drop of radius 2.0 \times 10 -5 m and density 1.2 \times 10 3 kgm -3 ? Take viscosity of liquid = 1.8 \times 10 -5 Nsm -2 . (Neglect buoyancy due to air).

Choose the correct answer: