A) 2.0 cm
B) 0.5 cm
C) 4.0 cm
D) 1.0 cm
Correct Answer: C
Solution :
\[r=\frac{mv}{qB}\Rightarrow r\propto v,\ \,\ \Rightarrow {{r}_{2}}=2{{r}_{1}}=2\times 2=4cm\]
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