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# JEE Class main Answered

Q.If an electron has an initial velocity in a direction different from that of an electric field,then the path of the electron is.....
Asked by Vidushi412 | 27 Mar, 2019, 07:36: PM
Expert Answer
`Let electric filed is along x axis and initial velocity of the electron be v which makes angle θ with x axis.So initial velocity of electron along x axis v_x = v cosθ and acclaration along x is a = -eE/m . (e = charge of electrn, m= mass of electron and E = magnitude of electric filed intensity). And intitial velocity along y direction is v_y = v sinθ, as there is on force electron along y direction so v_y remains unchanged with time.At any time t let the electron be at (x,y) position (assuming it starts from origin).Hence x = (v cosθ)t - 0.5(eE/m)t^2     and y = (v sinθ)t`
the path trace by electron would be a parabola.
Answered by Ankit K | 27 Mar, 2019, 07:46: PM
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