(1) (2.5 pts) MULTIPLE CHOICE: Choose ONE correct answer for each question.
(i) (1/2 pt) An EM wave travels in the +y direction. At one instant its E-field points in the -x direction and the B-field points in the ____ direction
(A) +y, (B) -y, (C) +z, (D) -z. (E) +x (F) -x
(ii) (1/2 pt) An EM wave's magnetic field amplitude is 9.0µT. Its electric field amplitude is ____.
(A) $1.80 \times 10^3$ V/m, (C) $2.00 \times 10^{-14}$ V/m
(B) $2.70 \times 10^3$ V/m, (D) $3.00 \times 10^{-14}$ V/m
(iii) (1/2 pt) In a reversible adiabatic process, entropy change is ____.
(A) ALWAYS positive, (C) ALWAYS zero,
(B) ALWAYS negative, (D) none of the above.
(iv) (1/2 pt) There are three identical spheres with different charges ($Q_A=+8C$, $Q_B=+4C$, $Q_C=-12C$)
$Q_A$ is briefly touched to $Q_C$ then $Q_C$ is briefly touched to $Q_B$. The final charge on $Q_C$ is ____.
(A) 0 C (B) -1C (C) -1/2 C (D) +1/2 C (E) +1 C
(v) (1/2 pt) The magnitude of voltage drop across an inductor is proportional to ____.
(A) the charge on the inductor, (B) the magnitude of current through the inductor,
(C) the change in current through the inductor, (D) the direction of current in the inductor
