An object A acquires positive charge `9.6muC`, when rubbed against another object B. Is there any change is mass of object B ? Will this increase or decrease the mass of B and how much ?

Explanation

Charging process via rubbing involves transfer of electrons from one object to another . Objects acquire equal and opposite charges . Object A acquires positive charge hence object B must be negative with same magnitude . The mass of one electron is `9.1xx10^(-31)` kg.
The mass of object acquiring negative charge will increase and that acquiring positive charge, it decreases by the same amount.
Hence, there will be increase in the mass of B.
Number of electrons transferred =`(9.6xx10^(-6))/(1.6xx10^(-19))=6xx10^13`
Increase in the mass of B =`(6xx10^13)xx(9.1xx10^(-31)kg)`
`=5.46xx10^(-17)` kg .