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  4. An electron, proton, deuteron and a-particle enter in a uniform electric field with the same velocity as shown. The greatest deviation is shown by <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/a7994867a02bf758f36e00c665bbd575-.png />

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Q. An electron, proton, deuteron and a-particle enter in a uniform electric field with the same velocity as shown. The greatest deviation is shown by
image

Electric Charges and Fields

Solution:

Since all of them have the same velocity, they will take the same time to cross over. Let it be $t$
$a=\frac{q E}{m} \,\,\,\,\, y=\frac{1}{2} a t^{2}=\frac{1}{2}\left(\frac{q E}{m}\right) t^{2}$
The deviation will be greatest for the one with greatest $q / m$ ratio. Here it is electron as its mass is very small compared to others