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
The spacecraft of mass M moves with velocity V in free space at first, then it explodes breaking into two pieces. If aft...Three particle start from origin at the same time with a velocity 2ms-1 along positive x-axis, the second with a velocit...A small ball collide with a heavy ball initially at rest. In the absence of any external impulsive force, it is possible...A 1 kg particle strikes a wall with velocity 1 m/s at an angle 30o and reflects at the same angle. If its remains in con...Two vessels A and B have the same base area and contain water to the same height, but the mass of water in A is four tim...