A particle of mass m and charge q is thr...

A particle of mass m and charge q is thrown from origin at t=0 with velocity `2hati+3hatj+4hatk` units in a region with uniform magnetic field `vecB=2hati` units. After time `t=pim//qB`, an electric field `vecE` is switched on such that particle moves on a straight line with constnat speed `vecE` may be:

`5hatk-10hatj` units

`-6hatjk-9hatj` units

`-6hatk+8hatj` units

`6hatk+8hatj` units

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