If the kinetic energy of an electron in a hydrogen is `(e^(2))/(8 pi epsi_(0)r)` then its potential energy is.....

Options

A. `(e^(2))/(4pi epsi_(0)r)`
B. `-(e^(2))/(4pi epsi_(0)r)`
C. `(e^(2))/(8pi epsi_(0)r)`
D. `-(e^(2))/(8pi epsi_(0)r)`

Answer

B

Explanation

Potential energy `=-2xx` kinetic energy
`=-2xx(e^(2))/(8pi epsi_(0)r)`
`=-(e^(2))/(4pi epsi_(0)r)`