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A capacitor consisting of two concentric spheres of radius R1 and R2 = 3.50·R1 has a...

A capacitor consisting of two concentric spheres of radius R1 and R2 = 3.50·R1 has a capacitance of C = 4.00 picoFarads and is charged to a potential difference of 68.0 Volts.

If the radius of the outer sphere is increased by a factor of 3.50 while keeping the charge on the plates constant, by what factor does the stored energy change?

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