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At a distance l from a uniformly charged...

At a distance l from a uniformly charged long wire, a charged particle is thrown radially outward with a velocity u in the direction perpendicular to the wire. When the particle reaches a distance 2l from the wire its speed is found to be `sqrt(2)u`. The magnitude of the velocity, when it is a distance 4l away from the wire, is (ignore gravity)

A

`sqrt(3)u`

B

2u

C

`2sqrt(2)u`

D

4u

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