One metallic sphere $A$ is given positive charge whereas another identical metallic sphere $B$ of exactly same mass as of $A$ is given equal amount of negative charge. Then
Mass of $A$ and mass of $B$ still remain equal
Mass of $A$ increases
Mass of $B$ decreases
Mass of $B$ increases
When the charge is considered as point ?
Mention the $SI$ unit and value of fundamental charge. Write its smaller units.
What are called conductors and non-conductors ? In which free electrons are more ? Conductor or non-conductor.
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?
How can the neutral body be charged electrically ?