15. At what distance from a long straight wire carrying a current of 5.0 A is the magnetic field due to the wire equal to the strength of the earth's field, 5.0 × 10⁻⁵ T?
(A) 0.02 m
(B) 0.2 m
(C) 2 m
(D) 20 m
(E) 200 m

16. The phasor diagrams on the right represent three oscillating emfs having different amplitudes and frequencies at a certain instant of time t = 0. As t increases, each phasor rotates counterclockwise and completely determines a sinusoidal oscillation. At the instant of time shown, the magnitude of ε associated with each phasor given in ascending order by diagrams is (A) a, b, c (B) b, c, a (C) a, c, b (D) c, b, a (E) need more information

17. A 2.0 microcoulomb particle with a kinetic energy of 0.10 J is fired into a uniform magnetic field of magnitude 0.10 T. If the particle moves in a uniform circular path of radius 3.0 m, determine its mass. (A) 1.3 × 10⁻¹² kg (B) 1.8 × 10⁻¹² kg (C) 3.1 × 10⁻¹² kg (D) 3.7 × 10⁻¹² kg (E) 4.2 × 10⁻¹² kg

18. Consider blackbody radiation. Suppose the intensity spectrum peaks at the wavelength λ for temperature T. According to Wien's Displacement Law, where would the spectrum reach its maximum when the temperature is increased to 2T? (A) λ/32 (B) λ/16 (C) λ/8 (D) λ/4 (E) λ/2

19. John presents a wedding ring to Mary. To impress her, he spins the ring about a vertical axis at a frequency of 60 Hz in a magnetic field of B = 0.5 T as shown. If the area of the ring is 2.0 × 10⁻⁴ m², calculate the maximum emf induced in the ring. (A) 0.038 V (B) 0.046 V (C) 0.052 V (D) 0.060 V (E) not enough information

20. An emf of 12.0 mV is induced in a 500 turn coil when the current is changing at a rate of 10.0 A/s. What is the magnetic flux through each turn of coil at the instant when the current is 3.00 A? (A) 1.4 × 10⁻⁶ T·m² (B) 2.2 × 10⁻⁶ T·m² (C) 5.4 × 10⁻⁶ T·m² (D) 7.2 × 10⁻⁶ T·m² (E) 8.8 × 10⁻⁶ T·m²

21. In which of the following materials does the light travel the fastest? (A) vacuum (B) water (n = 1.33) (C) glass (n = 1.50) (D) diamond (n = 2.42) (E) light travels at the same speed through all of the above materials

22. The importance of the Compton scattering experiment is that (A) it indicates that light has interference effects; (B) it shows that the speed of light is a constant in all directions; (C) it provides an accurate means to measure the speed of light; (D) it illustrates that the electron has wave nature; (E) it confirms the particle nature of radiation.

23. The light bulbs in the circuit (shown on the right) are identical. Ignore the internal resistance of the batteries. When the switch is closed, (A) nothing changes (B) both go out (C) the intensity of light bulb A increases (D) the intensity of light bulb A decreases (E) the intensity of light bulb B increases

24. A beam of light of wavelength 550 nm, traveling in air, is incident on a slab of transparent material. The incident beam makes an angle of 60° with the normal, and the refracted beam makes an angle of 30.0° with the normal. Find the index of refraction of the material. (A) 1.21 (B) 1.53 (C) 2.52 (D) 1.73 (E) 2.73

25. An object is placed in front of a convex mirror at the distance of 30.0 cm. Find the distance between the image and the mirror and the lateral magnification if the focal distance of the mirror is 20.0 cm. (A) 12 cm and +0.4 (B) 12 cm and -0.4 (C) 60 cm and +2.0 (D) 60 cm and -2.0 (E) 15 cm and +0.5

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