The inner conductor of two coaxial cylindrical conductors carries a charge per unit length +λ C/m, and the outer conductor is grounded.
Given that the electric field between the two conductors is E = (λ/2πεor) rˆ, find an expression for the electric potential difference between the cylinders.

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination.at the turning point, how far is the second student from the destination?