An electron moves straight inside a char...

An electron moves straight inside a charged parallel plate capacitor of uniform surface charge density `sigma`. The space between the plates is filled with constant magnetic field of induction `vecB`. The time of straight line motion of the electron in the capacitor is

`(esigma)/(epsilon_01B)`

`(epsilon_01B)/(sigma)`

`(e1sigma)/(epsilon_(0)B)`

`(epsilon_(0)1B)/(3sigma)`

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