Two objects are rubbed against each other, the nature of electric force, when they are placed at some distance is
Attractive
Repulsive
Both $(A)$ and $(B)$
Either $(A)$ or $(B)$
It is now believed that protons and neutrons (which constitute nuclei of ordinary matter) are themselves built out of more elementary units called quarks. A proton and a neutron consist of three quarks each. Two types of quarks, the so called 'up' quark (denoted by $u$) of charge $+(2 / 3) e,$ and the 'down' quark (denoted by $d$) of charge $(-1 / 3) e$ together with electrons build up ordinary matter. (Quarks of other types have also been found which give rise to different unusual varieties of matter.) Suggest a possible quark composition of a proton and neutron.
From what the name electricity is coined ? Explain its meaning.
If a body is charged by rubbing it. Its weight
Why the light particles like pith balls attract towards charged rod ?
Mention types of methods of charging the body.