12. A point charge q is placed at the center of a non-conducting spherical shell of inner radius r₁ and outer radius r₂. What is the electric field at a distance r from the center where r₁<r<r₂? (A) (B)(C) 0 (D)(E)

12. A point charge q is placed at the center of a non-conducting spherical shell of inner radius r₁ and outer radius r₂. What is the electric field at a distance r from the center where r₁<r<r₂?
(A)
(B)
(C) 0
(D)
(E)

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13. A rectangular loop of wire lies in the xy-plane with current I flowing in a clockwise direction when viewed from the positive z-axis. The loop dimensions are a along the x-axis and b along the y-axis. A uniform magnetic field B₀ along the positive z-direction is applied in the region. Using Ampere's Law, determine the net magnetic field at the center of the loop. (A) B₀ along the positive z-direction (B) B₀ along the positive x-direction (C) B₀ along the negative y-direction (D) B₀ along the negative z-direction (E) 0

12. A point charge q is placed at the center of a non-conducting spherical shell of inner radius r₁ and outer radius r₂. What is the electric field at a distance r from the center where r₁<r<r₂? (A) (B)(C) 0 (D)(E)

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12. A point charge q is placed at the center of a non-conducting spherical shell of inner radius r₁ and outer radius r₂. What is the electric field at a distance r from the center where r₁<r<r₂?
(A)
(B)
(C) 0
(D)
(E)