16. Two conducting spheres have radii R₁ and R₂, with R₁ greater than R₂. If they are far apart the capacitance is proportional to: (A)R₁R₂/(R₁-R₂) (B)R₁²-R₂² (C)(R₁-R₂)/(R₁R₂) (D)R₁²+R₂² (E)none of these

5. A solid wheel with mass M, radius R, and rotational inertia MR²/2, rolls without sliding on a horizontal surface. A horizontal force F is applied to the axle and the center of mass has an acceleration a. The magnitudes of the applied force F and the frictional force f of the surface, respectively, are: (A)F = Ma, f = 0 (B)F = Ma, f = Ma/2 (C)F = 2Ma, f = Ma (D)F = 2Ma, f = Ma/2 (E)F = 3Ma/2, f = Ma/2

16. Two conducting spheres have radii R₁ and R₂, with R₁ greater than R₂. If they are far apart the capacitance is proportional to:
(A)R₁R₂/(R₁-R₂)
(B)R₁²-R₂²
(C)(R₁-R₂)/(R₁R₂)
(D)R₁²+R₂²
(E)none of these

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