In the uniform electric field of E=1 10^4 NC^-1, an electron is accelerated from rest. The velocity of the electron when it has travelled a distance of 2 10^-2 m is nearly ... m s m^-1 (e/m) of elect…

Question

In the uniform electric field of E=1 10^4 NC^-1, an electron is accelerated from rest. The velocity of the electron when it has travelled a distance of 2 10^-2 m is nearly ... m s m^-1 (e/m) of electron (=1.8 10^11 Ckg^-1)

Accepted Answer

Correct answer: D. (d) Force on electron in uniform electric field is F= eE The acceleration of the electron is a= Fm= eEm where m is the mass of the electron. Starting from rest, the velocity of the electron. when it has travelled distance s is v= 2 as= 2 eEms Here, em=1.8 10^11C kg^-1 E=1 10^4 NC^-1 ands=2 10^-2 m ∴ v= 2 1.8 10^11 1 10^4 2 10^-2 =8.5 10^6 m s^-1

$In the uniform electric field of E = 1 \times 10^{4} NC^{- 1}, an electron is accelerated from rest. The velocity of the electron when it has travelled a distance of 2 \times 10^{- 2} m is nearly ... m s m^{- 1} (e / m) of electron (= 1.8 \times 10^{11} Ckg^{- 1})$

Solution

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