19. A dipole of dipole moment p is placed in a uniform electric field E. The maximum potential energy difference that can occur as the dipole is rotated is (A)0 (B)pE (C)2pE (D)πpE (E)pE/π

3. A spherical shell has inner radius R₁, outer radius R₂, and mass M, distributed uniformly throughout the shell. The magnitude of the gravitational force exerted on the shell by a point particle of mass m located a distance d from the center, outside the inner radius and inside the outer radius, is: (A)0 (B)GMm/d² (C)GMm/(R₂²-R₁³) (D)GMm(d³-R₁³)/d²(R₂³-R₁³) (E)GMm/(d²-R₁²)

19. A dipole of dipole moment p is placed in a uniform electric field E. The maximum potential energy difference that can occur as the dipole is rotated is
(A)0
(B)pE
(C)2pE
(D)πpE
(E)pE/π

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