Two metal plates have a potential difference of 150 V and are 5 mm apart. A charged particle of mass `1.96xx10^(-15)` kg is held in equilibrium between the plates. Find the charge on the particle.

Explanation

Given, `V_(B)-V_(A)=150V,r=5" mm"=5xx10^(-3)" m"`,
`m=1.96xx10^(-15)kg`
As, `mg=F,mg=(V)/(r)xxq`
`rArr" "q=(mgr)/(V)=(1.96xx10^(-15)xx10xx5xx10^(-3))/(150)=6.5xx10^(-19)C`