Final answer:
The context provided relates to problems in electromagnetism regarding charges and current-carrying wires. Specifically, calculating the electric field of a long, thin wire is a common application of Gauss's Law in physics.
Step-by-step explanation:
The original question seems to be about calculating the magnetic force on a charged particle near a current-carrying wire, but the reference text provided crosses several topics in electromagnetism.
To address one of the problems within the given reference, which is related to the charge per unit length on a wire, we can look at problem 43. It describes a very long, thin wire with a uniform linear charge density which implies an electric field calculation involved. To find the electric field at a certain distance from this charged wire, we would use Gauss's Law, which connects the electric field with the charge distribution.
Without additional context or specifics about the main question concerning the wire with charge per unit length 2.60×10-10 C/m, it is difficult to provide a clear and definitive answer.