A charged particle having kinetic energy...

A charged particle having kinetic energy `E` enters normally a region of uniform magnetic field between two plates `P_(1)` and `P_(2)` as shown in the figure. If the particle just misses hitting the plate `P_(2)`, then the magnetic field `B` in the region between the plates is

`mK//qd`

`2mK//qd`

`sqrt((mK)//qd)`

`sqrt((2mk))//qd`

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