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Question

A proton and an α particle having equal kinetic energy are projected in a uniform transverse electric field as shown in figure

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A
Proton trajectory is more curved
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B
α particle trajectory is more curve
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C
Both trajectories are equally curved but in opposite direction
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D
Both trajectories are equally curved and in same direction
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Solution

The correct option is A Proton trajectory is more curved
Equal kinetic energy.
But the trajectory will depend on acceleration which is F=qEm Which is eEmp for proton and 2eE4mp=eE2mp for α particle.
E is electric field , q is charge and mp is mass of one proton.
As they are opposite in charge so opposite direction and proton having more acceleration will show
more curved trajectory.
Option A is correct.

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