<s>[INST] By winding the string around a core of radius R and a length L, a simple coaxial resistor is formed. The string has a resistivity, η , and a cross-sectional area, A . The electrical resistance of the coaxial resistor is given by the formula R = η ( L / A ), where L is the total length of the string. If the string can be wound on the core either parallel or perpendicular to its axis, the resistors will have different resistances. A coaxial resistor has a radius, R, and a length, L. If the string is wound parallel to the core’s axis, calculate the total string length in terms of R and L.[/INST]