The ratio of diameters of two wires of same material is $n : 1$. The length of wires are $4\, m$ each. On applying the same load, the increase in length of thin wire will be
A$n^2\, times$
B$n\, times$
C$2n\, times$
D
None of the above
Medium
Download our app for free and get started
A$n^2\, times$
a $1 \propto \frac{\mathrm{FL}}{\mathrm{r}^{2} \mathrm{Y}} \Rightarrow 1 \propto \frac{1}{\mathrm{r}^{2}}[\mathrm{F}, \mathrm{L} \text { and } \mathrm{Y} \text { are constant }]$
Experience the future of education. Simply download our apps or reach out to us for more information. Let's shape the future of learning together!No signup needed.*
Two wires of copper having the length in the ratio $4 : 1$ and their radii ratio as $1 : 4$ are stretched by the same force. The ratio of longitudinal strain in the two will be
Steel ruptures when a shear of $3 .5 \times 10^8\,\,N\,m^{-2}$ is applied. The force needed to punch a $1\,cm$ diameter hole in a steel sheet $0.3\,cm$ thick is nearly
When a certain weight is suspended from a long uniform wire, its length increases by one cm. If the same weight is suspended from another wire of the same material and length but having a diameter half of the first one then the increase in length will be ........ $cm$
The breaking stress of aluminium is $7.5 \times 10^7 \,Nm ^{-2}$. The greatest length of aluminium wire that can hang vertically without breaking is $......... \times 10^3 \,m ($Density of aluminium is $2.7 \times 10^3 \,kg m ^{-3} )$
A wire elongates by $l$ $mm$ when a load $W$ is hanged from it. If the wire goes over a pulley and two weights $W$ each are hung at the two ends, the elongation of the wire will be (in $mm$)
A structural steel rod has a radius of $10\,mm$ and length of $1.0\,m.$ A $100\,kN$ force stretches it along its length . Young's modulus of structural steel is $2 \times 10^{11}\,Nm^{-2}.$ The percentage strain is about ....... $\%$
The diameter of a brass rod is 4 mm and Young's modulus of brass is $9 \times {10^{10}}\,N/{m^2}$. The force required to stretch by $0.1\%$ of its length is
Two wires of same diameter of the same material having the length $l$ and $2l.$ If the force $ F$ is applied on each, the ratio of the work done in the two wires will be
If Young's modulus of iron is $2 \times {10^{11}}\,N/{m^2}$ and the interatomic spacing between two molecules is $3 \times {10^{ - 10}}$metre, the interatomic force constant is ......... $N/m$