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  4. Which of the following particle will describe the smallest circle when projected with same velocity perpendicular to magnetic field ?

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Q. Which of the following particle will describe the smallest circle when projected with same velocity perpendicular to magnetic field ?

UPSEEUPSEE 2017

Solution:

We know that,
radius of circular path $(R)=\frac{mv}{qB}$
Here, $v, q$ and $B$ are same.
So, $R \propto m$.
The mass of electron is minimum. So, electron will describe the smallest circle when projected with same velocity perpendicular to magnetic field