Two identical He-filled spherical balloons each carrying a charge
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Q. Two identical He-filled spherical balloons each carrying a charge q are tied to a weight W with strings and float in equilibrium, as shown in the figure.
(a) Find the magnitude of q, assuming that the charge on each balloon acts as if its concentrated at the centre.
(b) Find the volume of each balloon. Take the
density of He as He and the density of air as a.
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