A) \[\frac{1}{15}\]
B) \[\frac{1}{30}\]
C) \[\frac{2}{15}\]
D) 15
Correct Answer: B
Solution :
Volume of copper rod \[=\pi {{(0.5)}^{2}}\times 8\,c{{m}^{3}}\] Volume of wire \[=\pi \times {{r}^{2}}\times 1800\,c{{m}^{3}}\] According to the question, \[=\pi \times {{r}^{2}}\times 1800=\pi \times 0.25\times 8\] \[\Rightarrow \] \[{{r}^{2}}=\frac{0.25\times 8}{1800}=\frac{1}{900}\] \[\Rightarrow \] \[r=\frac{1}{30}\,cm\]
You need to login to perform this action.
You will be redirected in
3 sec
