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The inner sphere has a higher potential than outer if the charge q is positive .
If the two spheres are connected through a wire , the charge will flow from high to low potential .
Thus , providing smaller potentials at the inner sphere will keep building large amount of charge at the outer sphere , till the breakdown field of air ( 3 x 10 6 V / m ) is reached .
o This accumulates close to millions of volts .
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