a)
electron moves from higher to lower potential.
electric potential energy decreases.
using concept of energy conservation, decreasing lectric potential energy will increase kinetic energy of electron.
increase in kinetic energy will increase the velocity of electron.
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b)
let us consider d is the distnace from the charge where we need to find electric potential or field
Electric potential, V = k Q / d
electric field E = k Q / d^2
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c)
as we know
0.5 m v^2 = qV
so, square of velocity is directly proportional to potential difference
v1^2 / v2^2 = V1 / V2
v2 / v1 = sqrt ( V2 / V1)
v2 / v1 = sqrt (2000/1000)
v2 / v1 = sqrt (2)
so new velocity must be sqrt(2) timea of previous value.
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do comment in case any doubt, will reply for sure.. Goodluck
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