19. Two protons are about 10⁻¹⁰ m apart. Their relative motion is chiefly determined by: (A) nuclear forces (B) electrical forces (C) gravitational forces (D) torque from electrical dipole moments (E) magnetic forces

10. In an oscillating series RLC circuit with R = 50 Ω, L = 20 mH and C = 2.0 μF, the maximum charge is stored on the capacitor at t = 0. Find the time required for the charge on the capacitor falling to 37% of its initial value. (A) 1. × 10⁻⁴ s (B) 2. × 10⁻⁴ s (C) 4. × 10⁻⁴ s (D) 6. × 10⁻⁴ s (E) 8. × 10⁻⁴ s

19. Two protons are about 10⁻¹⁰ m apart. Their relative motion is chiefly determined by:
(A) nuclear forces
(B) electrical forces
(C) gravitational forces
(D) torque from electrical dipole moments
(E) magnetic forces

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