Answer :


Charge density of the long-charged cylinder of length L and radius r is λ. Another same type of cylinder with radius R surrounded it.

Let E is the electric field produced in the space between the two cylinders.

Electric flux through a Gaussian surface is given by the Gaussian theorem as,

Φ = E(2πd)L

Where, d = distance of a point from common axis of the cylinders.

Let q be the total charge on the cylinder,

Φ = E(2πd)L =

Where, q = charge of the inner sphere of the outer cylinder

ϵ0 = permittivity of space


E(2πd)L =

Hence, the electric field between cylinders,

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