Answer:
Explanation:
Using Newton's second law, we calculate the magnitude of the electric force between the spheres:
The magnitude of the charge in both spheres is the same. So, we calculate the charge, using Coulomb's law:
I GEUSS A and COM is correct answer to this question
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So the question ask to formulate an expression to represent the amount of air required to inflate the balloon from a radius of R+4 and the expression would be V=16pi/3*(3r^2+12r+16). I hope you are satisfied with my answer and feel free to ask for more if you have question and further clarifications