Predict the results of the following experiment: a paramagnetic bar and a diamagnetic bar are pushed inside of a solenoid. 1. The paramagnet is pushed out, the diamagnet is sucked in 2. The diamagnet is pushed out, the paramagnet is sucked in 3. Both are sucked in, but with different force 4. Both are pushed out, but with different force Note: * CORRECT ANSWER: B

A very long aluminum (paramagnetic!) rod carries a uniformly distributed current $I$ along the $+z$ direction. What is the direction of the bound volume current? <img src="./images/Al_rod_example_current_shown.png" align="right" style="width: 250px";/> 1. $\mathbf{J}_B$ points parallel to $I$ 2. $\mathbf{J}_B$ points anti-parallel to $I$ 3. It’s zero! 4. Other/not sure Note: * CORRECT ANSWER: A

A very long aluminum (paramagnetic!) rod carries a uniformly distributed current $I$ along the $+z$ direction. We know $\mathbf{B}$ will be CCW as viewed from above. (Right?) What about $\mathbf{H}$ and $\mathbf{M}$ inside the cylinder? <img src="./images/Al_rod_example_B_shown.png" align="right" style="width: 250px";/> 1. Both are CCW 2. Both are CW 3. $\mathbf{H}$ is CCW, but $\mathbf{M}$ is CW 4. $\mathbf{H}$ is CW, $\mathbf{M}$ is CCW 5. ??? Note: * CORRECT ANSWER: A

A very long aluminum (paramagnetic!) rod carries a uniformly distributed current $I$ along the $+z$ direction. What is the direction of the bound volume current? <img src="./images/Al_rod_example_HBM_shown.png" align="right" style="width: 250px";/> 1. $\mathbf{J}_B$ points parallel to $I$ 2. $\mathbf{J}_B$ points anti-parallel to $I$ 3. It’s zero! 4. Other/not sure Note: * CORRECT ANSWER: A

A very long aluminum (paramagnetic!) rod carries a uniformly distributed current $I$ along the $+z$ direction. What is the direction of the bound surface current? <img src="./images/Al_rod_example_current_shown.png" align="right" style="width: 250px";/> 1. $\mathbf{K}_B$ points parallel to $I$ 2. $\mathbf{K}_B$ points anti-parallel to $I$ 3. Other/not sure Note: * CORRECT ANSWER: B