Inside a nucleus, a neutron can convert itself into a proton and an electron. A third particle known as antineutrino is also formed. Can you guess the charge present on antineutrino?

Conservation of charge $n\to p+e$ (antineutrino) Charge on a neutron is zero. Sum of charges on the three products must also be zero. Sum of charges on proton and electron is zero. Therefore, third particle must have no charge. In Short (i) Charge is a property of matter which is responsible for all electric and magnetic phenomena. (ii) Charge is of two types - positive and negative. (iii) Smallest charge in nature is electronic charge $\pm e=1.6\times 10^{-19}\mathrm{C}$. (iv) Charge of an isolated system is conserved. (v) In real life a body acquires charge due to gaining electrons or losing them. (vi) A body which loses electrons gets positively charged and one which gains them becomes negatively charged. (vii) Charge on a body which loses $n$ electrons is $q=+ne$ and the one which gains $n$ electrons has a charge $q=-ne$. (viii) If two bodies, made of different substances, are rubbed, electrons may get transferred from one of them to another. Therefore, the two bodies acquire equal and opposite charge. (ix) A conductor is a substance which has plenty of free electrons in it. These electrons help in movement of charge inside a conductor. An insulator does not have free electrons. (x) When a neutral body is brought close to a charged body (without touching it), there is separation of charge in the neutral body. Its face closer to the charged body acquires an opposite charge and the far face gets a charge similar to the charged body. This phenomenon is called induction. It happens in conductors as well as insulators.