Final answer:
For a 4-inch rigid metal conduit, the minimum bending radius by NEC standards should not be less than 24 inches.
Step-by-step explanation:
The question pertains to the bending radius of a 4-inch rigid metal conduit encasing Type THW wires. However, the provided information seems to be part of a physics problem related to the tension in wires and the deformation of a pole, which is not directly relevant to the question about conduit bending radius. The standard bending radius for conduits is typically given in National Electrical Code (NEC) standards, and for a 4-inch rigid metal conduit, the bending radius is not to be less than 6 times the diameter of the conduit. Therefore, for a 4-inch conduit, the bending radius should not be less than 24 inches.