A) 2/10 cm
B) \[2/\sqrt{10}\,cm\]
C) \[1/\sqrt{10}\,cm\]
D) \[1/10\,\,cm\]
Correct Answer: C
Solution :
Ans. Volume of rod = Volume of wire \[\Rightarrow \] \[\pi {{r}^{2}}h=\pi {{r}^{2}}h\] \[\Rightarrow \] \[\pi \,\times \,{{(1)}^{2}}\times 30=\pi \times {{r}^{2}}\times 300\] \[\Rightarrow \] \[{{r}^{2}}=\frac{30}{300}\] \[\therefore \] \[r=\frac{1}{\sqrt{10}}\,cm\]
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