$A$ body has a charge of $-3.2 \mu C$. The number of excess electrons will be

How much positive and negative charge is there in a cup of water $(250 \; g)$?

How can you represent experimentally that $(i)$ there are two types of charges and $(ii)$ there is repulsion between two like charges and attraction between two unlike charges?

Which of the following charges is possible?
$(a)\ 3.2 \times 10^{-20} C$ $(b)\ 3.2 \times 10^{-18} C$
$(c)\ 3 \times 10^{-19} C$ $(d)\ 6 \times 10^{-17} C$

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

Discuss the phenomena experienced due to electrostatics.