The magnetic field vector of an electromagnetic wave is given by B = B0 (i + j) cos(kz - ωt) / √2, where i and j represent unit vectors along the x and y-axis respectively. At t = 0 s, two electric charges q1 of 4π C and q2 of 2π C located at (0, 0, π/k) and (0, 0, 3π/k) respectively, have the same velocity of 0.5c i (where c is the velocity of light). The ratio of the Lorentz force acting on charge q1 to q2 is:

Match List I (Electromagnetic wave) with List II (Production method): List I: A. Microwave B. Visible light C. Gamma rays D. Infrared rays List II: I. Electrons in atoms emit light when moving from a higher to a lower energy level II. Radioactive decay of the nucleus III. Vibration of atoms and molecules IV. Klystron valve or magnetron valve Choose the correct matching:

For a plane electromagnetic wave propagating along the +x-direction, which of the following combinations gives the correct possible directions for the electric field (E) and magnetic field (B) respectively?