A) \[\frac{r}{4}\]
B) \[\frac{r}{2}\]
C) \[2r\]
D) \[4r\]
Correct Answer: D
Solution :
\[r=\frac{mv}{qB}\Rightarrow \frac{{{r}_{1}}}{{{r}_{2}}}=\frac{{{v}_{1}}}{{{v}_{2}}}\times \frac{{{B}_{2}}}{{{B}_{1}}}\Rightarrow \frac{{{r}_{1}}}{{{r}_{2}}}=\frac{1}{2}\times \frac{1}{2}=\frac{1}{4}\] \[{{r}_{2}}=4{{r}_{1}}\]
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