A) 1.25 cm
B) 2.5 cm
C) 12.5 cm
D) 25.0 cm
Correct Answer: D
Solution :
\[r=\frac{\sqrt{2mE}}{qB}=\frac{\sqrt{2\times 9\times {{10}^{-31}}\times 7.2\times {{10}^{-18}}}}{1.6\times {{10}^{-19}}\times 9\times {{10}^{-5}}}\] = 0.25 m = 25 cm
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