A particle with charge e and mass m. mov...

A particle with charge e and mass m. moving along the X-axis with a uniform speed u enters a region where a uniform electric field F, is acting along The Y-axis. The particle starts to move in a parabola, its focal length (neglecting any effect of gravity) is

`(2 "mu"^(2))/(eE)`

`(eE)/(2"mu"^(2))`

`("mu")/(2eE)`

`("mu"^(2))/(2eE)`

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