13. The magnetic field from a current I flowing in a straight segment of wire of length L at a point located a perpendicular distance L from the end of the segment is μ₀I/4πL times (A) 1 (B) 23/2 (C) 21/2 (D) 2-1/2(E) 2-3/2.

6. Choose the INCORRECT statement: (A) Gauss's law holds in a vacuum (B) Gauss's law states that the net number of lines crossing any closed surface in an outward direction is proportional to the net charge enclosed within the surface (C) Coulomb's law can be derived from Gauss's law and symmetry (D) Gauss's law applies to a closed surface of any shape (E) according to Gauss's law, if a closed surface encloses no charge, then the electric field must vanish everywhere on the Gaussian surface.

13. The magnetic field from a current I flowing in a straight segment of wire of length L at a point located a perpendicular distance L from the end of the segment is μ₀I/4πL times
(A) 1
(B) 2^3/2
(C) 2^1/2
(D) 2^-1/2
(E) 2^-3/2.

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