A) 1.2 mm
B) 2.4 mm
C) 0.6 mm
D) 0.4 mm
Correct Answer: B
Solution :
\[h\propto \frac{1}{r}\]\\[{{r}_{1}}{{h}_{1}}={{r}_{2}}{{h}_{2}}\Rightarrow {{h}_{2}}=\frac{{{r}_{1}}{{h}_{1}}}{{{r}_{2}}}=2.4\ mm\]
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