3. Which of the following has the correct dimensions of the permeability constant μ₀ (in SI units)? (A) T·m/A² (B) N·m²/C² (C) N/A² (D) J/A (E) none of the above.

8. Consider a cube of density ρ and horizontal cross-sectional area L² with vertical height L. The cube is floating in a liquid with density ρ_L. At equilibrium a fraction L₀/L of the cube is immersed in the liquid. Now let's push down the cube a little bit and release it. What is the period of the subsequent oscillation? (A) (B)(C)(D)(E) none of the above.

3. Which of the following has the correct dimensions of the permeability constant μ₀ (in SI units)?
(A) T·m/A²
(B) N·m²/C²
(C) N/A²
(D) J/A
(E) none of the above.

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