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30. Figure 30 shows a uniform magnetic field B confined to a cylindrical volume of radius R. The magnitude of B is decreasing at a constant rate of 10 mT/s. In unit-vector notation, (A)the initial acceleration of an electron released at point a (r=5 cm) is (4.4×10⁷ i)m/s². (B)the initial acceleration of an electron released at point b (r=0) is nonzero. (C)the initial acceleration of an electron released at point c (r=5 cm) is (4.4×10⁷ i)m/s². (D)the electric field at point a (r=5 cm) is (+2.5×10⁻⁴ j)V/m. (E)the electric field at point c (r=5 cm) is (-2.5×10⁻⁴ j)V/m.

複選題29. A capacitor of capacitance C₁=6 μF is connected in series with a capacitor of capacitance C₂=4 μF, and a potential difference of 200V is applied across the pair. (A)The equivalent capacitance is 2.4 μF. (B)Charge q₁ on capacitor 1 is 4.8×10⁻⁴ C. (C)The potential difference V₁ on capacitor 1 is 80 V. (D)Charge q₂ on capacitor 2 is 4.8×10⁻⁴ C. (E)The potential difference V₂ on capacitor 2 is 120 V.

複選題28. A solid nonconducting sphere of radius R = 5.6 cm has a nonuniform charge distribution of volume charge density ρ = (14.1 pC/m³)r/R, where r is radial distance from the sphere's center. (A)The shell theorem cannot be applied in this case. (B)The sphere's total charge is 7.78×10⁻¹³ C. (C)The magnitude of the electric field at r = 0 is zero. (D)The magnitude of the electric field at r = R/2 is 5.58×10⁻³ N/C. (E)The magnitude of the electric field at r = R is 1.12×10⁻² N/C.

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