Question 113: 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 $$	imes$$ 103 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 103 kgm-3 ? Take viscosity of liquid = 1.8 \times 10-5 Nsm-$2. (Neglect buoyancy due to air).

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