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Two charged plates A and B are at the sa...

Two charged plates `A` and `B` are at the same electrical potential, and parallel and separated by a distance `d.` A unifrom magnetic induction field `B` acts perpendicular to plane of paper (and parallel to plates)n between the plates. Particels,each with charge `q`, mass `m` and kinetic energy `K` are shot throgh a hole in `A` directly towards `B`, each particle entering the hole perpendicular to `A`, An ammeter `AM` connected to an electrical network is connected to `B` and measures the current collected by the plate `B`, as the particles hit it. The limited value of the fied `B` for which the ammeter will stop showing a current is

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