### Tutorial today * Click 'A' once you finish page 1 * Click 'B' once you finish page 2 * Click 'C' once you finish page 3

A neutral copper sphere has a spherical hollow in the center. A charge $+q$ is placed in the center of the hollow. What is the total charge on the outside surface of the copper sphere? (Assume Electrostatic equilibrium.) <img src="./images/coppersphere_hole_and_charge.png" align="left" style="width: 350px";/> 1. Zero 2. $-q$ 3. $+q$ 4. $0 < q_{outer} < +q$ 5. $-q < q_{outer} < 0$

<img src="./images/cylinder_charge_outside.png" align="right" style="width: 250px";/> A long coax has total charge $+Q$ on the OUTER conductor. The INNER conductor is neutral. What is the sign of the potential difference, $\Delta V = V(c)-V(0)$, between the center of the inner conductor ($s = 0$) and the outside of the outer conductor? 1. Positive 2. Negative 3. Zero Note: * CORRECT ANSWER: C