Two metal pieces having a potential difference of `800V` are `0.02 m` apart horizontally. A particle of mass `1.96xx10^(-15) kg` is suspended in equilibrium between the plates. If the `e` is the elementary charge, then charge on the particle is

Options

A. 2e
B. 3e
C. 6e
D. 8e

Answer

b

Explanation

`V=800V`
`E=(V)/(d)=(800)/(2xx10^(-2))V//m`
`=4xx10^(4)V//m`
`qE=mg`
`rArrq=(mg)/(E )`
`=(1.96xx10^(-15)xx9.8)/(4xx10^(4))` coulomb
`=(1.96xx10^(15)xx9.8)/(4xx10^(4)xx1.6xx10^(-19)` elementary charges
`=3e`