A particle with charge 8.00 A particle with charge 8.00 x 10-19C is placed on th

Question

A particle with charge 8.00 A particle with charge 8.00 x 10-19C is placed on the x axis in a region where the electric potential due to other charges increases in the +x direction but does not change in the y or z direction. Part A The particle, initially at rest, is acted upon only by the electric force and moves from point a to point b along the x axis, increasing its kinetic energy by 1.60 x 10-18J. In what direction and through what potential difference Vb - Va does the particle move? The particle moves to the left through a potential difference of Vb - Va = 2.00V. The particle moves to the left through a potential difference of Vb - Va = -2.00V The particle moves to the right through a potential difference of Vb - Va = 2.00V. The particle moves to the right through a potential difference of Vb - Va = -2.00V The particle moves to the left through a potential difference of Vb - Va = 20.0V. The particle moves to the right through a potential difference of Vb - Va = -20.0V.

Explanation / Answer

electron always mioves from lower to heigher potenial because it's charge is -ve,

initially it's energy at b =1.6*10^-18,

so to overcome ,

it's net potential energy must be -1.6*10^-18J

so potentrial must bbe PE/q = 2 V,

now,

so it'll move to a higeher potential state ,

so,

if Vb- Va = 2...it will move towards right and

if Vb- Va = - 2...it will move towards left

and

if Vb- Va = 20...it will move towards right   

if Vb- Va = -20...it will move towards left

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