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: