# physics

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Two conducting thin hollow cylinders are co-aligned. The inner cylinder has a radius R1 , the outer has a radius R2 . Calculate the electric potential difference V(R2)−V(R1) between the two cylinders. The inner cylinder has a surface charge density of σa=−σ , where σ>0 , and the outer surface has a surface charge density of σb=3σ ,

The cylinders are much much longer than R1 . Thus, you may ignore end effects and neglect the thickness of the cylinders.

a. What is the electric potential difference between the outer cylinder and the inner cylinder V(R2)−V(R1)?

b. What is the magnitude of the electric field outside the cylinders, r>R2?

c. What is the electric potential difference between a point at a distance r=2*R2 from the symmetry axis and the outer cylinder V(2*R2)−V(R2)?

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a. Gauss law applies. I would set V=0 on the inner cylinder, since V =0 is an arbitrary location.
Then, between the cylinders, you know E due to the enclosed charge (gauss law).
Potential then is INTEGRAL of E dr. That is straightforward.

b. E outside? You know the NET charge enclosed, find E for that for an infinitely long cylinder

c. Again, now set V=0 at R2, then compute V at any r as in a.

• physics -

and the aswers are?

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