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A particle ( mass = m and charge = q ) i...

A particle ( mass = m and charge = q ) is moving in a region in which there exists a uniform electric field `E vec( i ) ` and a uniform magnetic field `B hat (k) `. At t = 0 , the particle is at ( 0,a ) and is moving with `v hat(i) `. After some time, the particle is located at ( 2a, 0 ) and has a velocity `- 2 v hat( j ) ` , then which of the following is true ?

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