Find the magnitude of the electric field at the point a distance r from the cent

Question

Find the magnitude of the electric field at the point a distance r from the central axis of the inner cylinder, where r > R3 (outside both cylinders).

007 A long inner cylinder with radius R1 and an outer cylindrical shell with inner radius R2 and outer radius R3 arc concentric as shown. These cylinders extends out perpendicular to the plane shown. The charge on the inner cylinder per unit length is lambda > 0 and the corresponding charge on the outer cylindrical shell per unit length is Lambda/2 (half the magnitude and same sign). Find the magnitude of the electric field at the point a distance r from the central axis of the inner cylinder. where r > R3: (outside both cylinders).

Explanation / Answer

option 4 is the correct answer.

Enet = E1 + E2

= lamda/(2*pi*epsilon*r) + (lamda/2)/(2*pi*epsilon*r)

= 3*lamda/(4*pi*epsilon*r)

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