When a body is connected to the earth,electrons from the earth flow into the body. This means the body is initially:

While doing his experiment,Millikan one day observed the following charges on a single drop:
$(i)$ $6.563 \times 10^{-19} \ C$
$(ii)$ $8.204 \times 10^{-19} \ C$
$(iii)$ $11.50 \times 10^{-19} \ C$
$(iv)$ $13.13 \times 10^{-19} \ C$
$(v)$ $16.48 \times 10^{-19} \ C$
$(vi)$ $18.09 \times 10^{-19} \ C$
From this data,the value of the elementary charge $(e)$ was found to be:

Write the law of conservation of charge. Give one example.

$A$ polythene piece rubbed with wool is found to have a negative charge of $3 \times 10^{-7} \;C$.
$(a)$ Estimate the number of electrons transferred (from which to which?)
$(b)$ Is there a transfer of mass from wool to polythene?

In Millikan's oil drop experiment for the determination of the charge on the electron,the reason for using oil is:

Which scientist represented the types of charges?