A rod of length l and negligible mass is suspended at its two ends by two wire of steel (wire A) and aluminum (wire B) of equal lengths (figure). The cross-sectional areas of wires A and B are 1.0 mm^2 and 2.0 mm^2, respectively.

Q: A rod of length l and negligible mass is suspended at its two ends by two wire of steel (wire A) and aluminum (wire B) of equal lengths (figure). The cross-sectional areas of wires A and B are 1.0 mm^2 and 2.0 mm^2, respectively.

(Y_AL = 70 × 10⁹ Nm^-2 and Y_steel = 200 × 10⁹ N m^-2

(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

Ans: (b) & (d)