A) Trajectory of electron is less curved
B) Trajectory of proton is less curved
C) Both trajectories are equally curved
D) Both move on straight-line path
Correct Answer: B
Solution :
We have \[qvB=\frac{m{{v}^{2}}}{r}\] or \[r=\frac{mv}{qB}=\frac{\sqrt{2mK}}{qB}\] For same kinetic energy K, we have \[r\propto \sqrt{m}\] Hence path of proton will have larger r and is therefore less curved.
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