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## Homework Statement

The mass of an electron is 9*10^-31kg. Find the charge in mass of a charged body if it loses 1 Coulomb of negative charge. Use your answer to explain why electricity was originally thought to be weight less.

1 coulomb = 6.642*10^18 elementary charges.

## Homework Equations

Everything given in question is above.

## The Attempt at a Solution

Since we know that charging of a body depends upon transfer of electrons. So, if a body becomes negatively charged it will gain electrons that is its mass will increase and if a body becomes positively charged it loses electrons hence its mass will decrease. Don’t know where to start with formulas etc. help would be appreciated.