A particle of mass an charge `q` is projected vertically upwards .A uniform electric field `vec(E)` is acted vertically downwards.The most appropiate graph between potential energy `U` (gravitaion plus eelectrostatic) and height h(lt lt radius of earth) is :(assume `U` to be zero on surface of earth)

Options

A.
B.
C.
D.

Answer

1

Explanation

Potential at a distance `2cm` from its centre
`=(Q)/(4piepsilon_(0)r)=(4pir^(2)sigma)/(4piepsilon_(0)r')rArr (r^(2)sigma)/(epsilon_(0)r)=(sigma)/(2epsilon_(0))xx(1)/(100)`
since `r=1cm` and `r=2cm`
PDb//w the two point is equal to `(sigma)/(200epsilon_(0))`
Work done =`VQ=(sigma)/(200epsilon_(0))X2xx10^(-8)=11xx10^(-4)J`