A) \[10\,cm\]
B) \[15\,cm\]
C) \[18\,cm\]
D) \[20\,cm\]
Correct Answer: D
Solution :
According to question Volume of solid cylinder = Volume of hollow cylinder \[\pi {{R}^{2}}H=\pi h\,\left( r_{1}^{2}-r_{2}^{2} \right)\] Radius \[{{R}^{2}}=\frac{\pi \times 300\left( {{2}^{2}}-{{1}^{1}} \right)}{\pi \times 9}\] \[{{R}^{2}}=\frac{300\times 3}{9},\,\,R=\,10\,cm\] \[\therefore \] Diameter of solid cylinder = 2R \[=\,\,2\times 10=\]
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