A semi-circular ring of copper has an inner radius 6 cm, radial thickness 3 cm and an axial thickness 3 cm. Find the resistance of the ring at 50 degree Celsius between its two end-faces. Assume specific resistance of Cu at 20 degree Celsius to be 1.724 micro ohm-cm and resistance coefficient of Cu at 0 degree Celsius to be 0.0043 per degree Celsius.
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