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A particle of mass m and charge q is released from rest in a uniform electric field. If there is no other force on the particle, the dependence of its speed v on the distance x travelled by it is correctly given by (graphs are schematic and not drawn to scale)
PhysicsMotion In One DimensionJEE MainJEE Main 2020 (08 Jan Shift 2)
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Solution:
2355 Upvotes Verified Answer
The correct answer is:

The particle is at rest initially.

So, the initial velocity u=0 m s-1.

The force on the charged particle in the uniform electric field,

F=qE

 ma=qE

 a=qEm

Applying the velocity-displacement equation under constant acceleration,

v2=u2+2ax

 v2=02+2qEmx

 v2=2qEmx

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