Two similar helium-filled spherical balloons tied to a 5g weight with strings and each carrying a charge q floats in equilibrium as shown in figure`-1.457`. Find (a) the magnitude of q, assuming that the charge on each balloon acts as ifit were concentrated at the centre and (b) the volume of each balloon. Neglect weight of the unfilled balloons and take density ofair `1.29 kg//m^(3)` and the density of helium in the balloons `0.2 kg//m^(3):`

Answer

`(a)0.55muC,(b)2.294xx10^(-3)m^(3)`