Physics ASAP PLease

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A spherical capacitor consists of a spherical conducting shell of radius b and charge -Q concentric with a smaller conducting sphere of radius a and charge +Q . Enter an expression for the capacitance of this device in terms of Coulomb's Constnat K_e (just type "k") and the two radii a and b. HINT: you may need to apply a negative sign to your final expression to be sure the capacitance comes out positive! Look at your answer and think about which radii is larger

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