A rod of length l and negligible mass is suspended at its two ends by two wires of steel (wire A) and aluminium (wire B) of equal lengths (Fig. 9.4). The cross-sectional areas of wires A and B are 1.0 mm2 and 2.0 mm2, respectively.
(a) Mass m should be suspended close to wire A to have equal stresses in both the wires.
(b) Mass m should be suspended close to B to have equal stresses in both the wires.
(c) Mass m should be suspended at the middle of the wires to have equal stresses in both the wires.
(d) Mass m should be suspended close to wire A to have equal strain in both wires.