An electron of mass m and charge q is accelerated from rest in a uniform electric field of strength E. The velocity acquired by it as it travels a distance l is

Options

A. `sqrt((2Eql)/m)`
B. `sqrt((2Eq)/(ml))`
C. `sqrt((2Em)/(ql))`
D. `sqrt((2Em)/(ql))`

Answer

A

Explanation

Here `u=0, a=(qE)/m`
s=l and v=?
`v^(2)=u^(2)+2as`
`v^(2)=0+2 (qEl)/m, v=sqrt((2qEl)/m)`