Lecture 29 iq25
1. Velocity selector
2. Hall effect: h2: 006-010
o Experiment which determines the sign of the carrier charge.
o Direction of Hall current
o Calculate the Hall voltage
o Relationship between number density and the mass density.
o One mole has
§ the molar mass M, and
§ the total # of free electrons =(# valence electrons)NA.
3. Sliding bar
o Magnetic force ahd polarized charges
o plalrization field, sign of emf.
o Mechanical power =electric dissipative power
4. Hint on two problems in h3
o 002
o Magnetic force and polarized charges
o Direction of the emf is determined by the direction of the magnetic force
o 016 emf generated in a rotating loop
Announcement:
Learning module:
Feedback will be incorporated into the lecture.
The learning modules will count as part of the homework score: instead of homework accounting for 15%, we now have homework at 12% and leaning modules at 3%.
Feedback on homework: This feedback will be used as the basic content for discussion sessions. In order to encourage participation, we have made HW feedback part of the iq clicker credit:
o iq clicker now counts for 5%,
o while feedback counts for 2%.
The latter is an easy 2%, as all you need to do is tell us which problem you found most confusing on a particular assignment and why. The feedback will be due on the same evening the homework is due, but the due time will be 11:50 to give those last-minute types a chance to enter feedback after completing the homework.
Words from Josh: “Please note that I will be reading the feedback, so if you enter something like "no comment" or a random string of keystrokes, you will not receive credit. Please make a sincere effort to give quality feedback, as it will have a direct effect upon the quality of your instruction.”