1. [0.5 points] Which of the following Maxwell's equations supports that a magnetic monopole (supposedly a magnetic charge) does not exist? A. E . dA = lenc ED B. $ B . dA = 0 C. DE . ds = - dom dt D. 5B . dS = Hol + Hoco at 2. [0.5 points] Which of the following best explains formation of rainbows? A. Red shift B. Blue shift C. Polarization D. Dispersion E. Diffraction 3. [0.5 points] In Young's double-slit interference pattern, how is the width of the interference fringes affected if you decrease the slit separation while keeping wavelength of light and distance of the screen from the slit unchanged? A. There is no effect of slit separation on the width of the interference fringes. B. The bright fringes get narrower while the dark fringes get wider. C. The bright fringes get wider while the dark fringes get narrower. D. All bright and dark fringes get narrower. E. All bright and dark fringes get wider. 4. [0.5 points] A standing wave on a string vibrates as shown. If the string tension is quadrupled while the frequency and length are kept unchanged, which of the following standing wave patterns is produced? Original standing wave A. B. C . D