Momentum and CollisionHard
Question
A tiny spherical oil drop carrying a net charge q is balanced in still air with a vertical uniform electric field of strength 
× 105 Vm-1. When the field is switched off, the drop is observed to fall with terminal velocity 2 × 10-3 ms-1. Given g = 9.8 ms-2, viscosity of the air = 1.8 × 10-5 Ns m-2 and the density of oil = 900 kg m-3, the magnitude of q is
× 105 Vm-1. When the field is switched off, the drop is observed to fall with terminal velocity 2 × 10-3 ms-1. Given g = 9.8 ms-2, viscosity of the air = 1.8 × 10-5 Ns m-2 and the density of oil = 900 kg m-3, the magnitude of q isOptions
A.1.6 × 10-19 C
B.3.2 × 10-19 C
C.4.8 × 10-19 C
D.8.0 × 10-19 C
Solution
πR3 ρg = qE = 6πηRvT∴ q = 8.0 × 10-19 C
Create a free account to view solution
View Solution FreeMore Momentum and Collision Questions
An open pan P filled with water (density ρw) is placed on a vertical rod, maintaining equilibrium. A block of densi...A ball is made of a material of density ρ where ρoil water with ρoil and ρwater representing the den...A body A of mass M while falling vertically downwards under gravity breaks into two parts; a body B of mass 1/3 M and a ...A point mass of 1 kg collides elastically with a stationary point mass of 5 kg. After their collision, the 1 kg mass rev...The rate of flow of liquid through a capillary tube, in an experiment to determine the viscosity of the liquid, increase...