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 (figure). The crosse-sectional areas of wires \(A\) and \(B\) are \(1.0~\text{mm}^2\) and \(2.0~\text{mm}^2\) respectively. \((Y_{\text{Al}}=70\times10^9~\text{N/m}^2\) and \(Y_{\text{steel}}=200\times10^9~\text{N/m}^2)\)
(a) |
Mass \(m\) should be suspended close to wire \(A\) to have equal stresses in both wires. |
(b) |
Mass \(m\) should be suspended close to \(B\) to have equal stresses in both wires. |
(c) |
Mass \(m\) should be suspended in the middle of the wires to have equal stresses in both wires. |
(d) |
Mass \(m\) should be suspended close to wire \(A\) to have equal strain in both wires. |
The correct statements are:
1. (b, c)
2. (a, d)
3. (b, d)
4. (c, d)