Which of the following properties is $NOT$ satisfied by a static electric charge?

$A$ 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?

The number of electrons in $1.6 \, C$ charge will be

The charge on $500\,cc$ of water due to protons will be

Five balls numbered $1$ to $5$ are suspended using separate threads. Pairs $(1, 2)$,$(2, 4)$,and $(4, 1)$ show electrostatic attraction,while pairs $(2, 3)$ and $(4, 5)$ show repulsion. Therefore,ball $1$ must be:

The charge on an $\alpha$-particle is: