NEET-XII-Physics
02: Electrostatic Potential And Capacitance
- #17A long charged cylinder of linear charged density λ is surrounded by a hollow co-axial conducting cylinder. What is the electric field in the space between the two cylinders?
Ans : Charge density of the long charged cylinder of length L and radius r is λ.
Another cylinder of same length surrounds the pervious cylinder. The radius of this cylinder is R.
Let E be the electric field produced in the space between the two cylinders.
Electric flux through the Gaussian surface is given by Gauss’s theorem as,
Where, d = Distance of a point from the common axis of the cylinders
Let q be the total charge on the cylinder.
It can be written as
Where,
q = Charge on the inner sphere of the outer cylinder
∈0 = Permittivity of free space
Therefore, the electric field in the space between the two cylinders is
.