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Question

A metallic sphere of radius R1 and charge +Q is nested inside a metallic spherical shell that has radius R2 and charge Q.
Which of the following changes will increase the capacitance of the system?
I: Increase the magnitude of the charge, Q.

II: Increase R2 while leaving R1 fixed.
III: Increase R1 while leaving R2 fixed.
IV: Increase both R1 and R2 while leaving the difference in radii, R2R1, fixed.

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A
I only
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B
II only
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C
III only
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D
III and IV only
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E
II, III, and IV only
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