Happy Wednesday - hump day!!
If you missed Wednesday's 10 am Zoom session, check it out here.
If you missed Thursday's 10 am Zoom session, check it out here.
If you missed Friday's 2 pm Zoom session, check it out here.
Thursday and Friday we will focus on a case of Faraday's law, or induced voltage = emf = -d(BA)/dt. The product BA = magnetic flux. If you can change the magnetic flux through a circuit or conductor, voltage 'turns on,' or is induced. You've done this before in the lab by moving a magnet in and out of a solenoid.
The first case we will look at is in Packet 2, which is when we do nothing with the magnet but move a conductor so that the area for the flux changes, or emf = B dA/dt.
Check out two short videos, which we will then get into the details Thursday.
- moving a conductor through a B-field makes it act like a battery
- moving a hoop of wire into or out of a B-field turns on a current in the circuit
For Friday, we will check the case if a circuit falls through a B-field (like that happens everyday!).
- circuit falling through B-field
For anyone who is interested, a supplemental case of rotating a piece of metal in a B-field is explained in this video.
Practice problems for Wednesday, Thursday and Friday:
In Packet 2, we will go through the 4 AP Problems on pages 5-8. The last one, "The Hardest Ever," is out there as a challenge!! Try them at your convenience, the ones with the years on them can be looked up in our AP Exams page on the school site. Help each other with chat sessions, or Zoom with each other, etc. We'll check some of these Thursday and Friday!
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