Advertisements
Advertisements
Question
A charged oil drop weighing 1.6 x 10-15 N is found to remain suspended in a uniform electric field of intensity 2 x 103 Nc-1. Find the charge on the drop.
Advertisements
Solution
Weight of the charged oil drop = `1.6 xx 10^-15`N.
Electric field = `2 xx 10^3 "NC"^-1`
∴ F = mg = qE
∴ q = `("mg")/"E" = (1.6 xx 10^-15)/(2 xx 10^3)`C
q = `0.8 xx 10^-18`C
APPEARS IN
RELATED QUESTIONS
The field lines of a negative point charge are as shown in the figure. Does the kinetic energy of a small negative charge increase or decrease in going from B to A?
The intensity of the electric field at a point at a perpendicular distance ‘r’ from an infinite line charge, having linear charge density ‘λ’ is given by:
A hemisphere is uniformly charged positively. The electric field at a point on a diameter away from the centre is directed ______.
A solid sphere of radius R has a charge Q distributed in its volume with a charge density ρ = kra, where k and a are constants and r is the distance from its centre. If the electric field at r = `"R"/2` is `1/8` times that at r = R, the value of a is ______.
An electron falls from rest through a vertical distance h in a uniform and vertically upward directed electric field E. The direction of electric field is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest in it through the same vertical distance h. The time of fall of the electron, in comparison to the time of fall of the proton is ______.
A particle of charge q and mass m moves rectilinearly under the action of electric field E = A – Bx, where A and B are positive constants and x is distance from the point where particle was initially at rest then the distance traveled by the particle before coming to rest and acceleration of particle at that moment are respectively.
Let there be a spherically symmetric charge distribution with charge density varying as `rho("r") = rho_0(5/4 - "r"/"R")` upto r = R, and `rho("r") = 0` for r > R, where r is the distance from the origin. The electric field at a distance r(r < R) from the origin is given by _________.
Electric lines of force about negative point charge are ______
Consider two identical point charges located at points (0, 0) and (a, 0).
Is there a point on the line joining them at which the electric field is zero?
An isolated point charge particle produces an electric field `vecE` at a point 3 m away from it. The distance of the point at which the field is `vecE/4` will be ______.
