The Laws of Faraday and Lenz (152)
BlackBoard Notes

• Note 1 for Jeff: Remember to print out worksheets and Magnet Warning signs (4 - two outside lab door, one above horseshoe magnet, one on blackboard), and set power supply in stockroom to 6 volts!
• Note 2 for Jeff: There probably isn't room on the blackboard, but they should be reminded to bring their Ohm's Law journal and I vs. V KaleidaGraph file next week for the systematic error lab

======================= Photo - Click for a Larger Version =============================

======================= First Board Section =============================

• Faraday's Law:
  • 
• (Place magnetic field warning sign in this section; use four small magnets, found in upper corner of blackboard)
• Next week: Bring Ohm's Law journal and KaliedaGraph graph file to lab!

============== Second Board Section - Two Pics in this Section!! ====================

• Compass: Which end points in the direction of B?

• Bar magnet: Check polarity with compass at ends

• Do Not stick bar magnets to the horseshoe magnet!

======================= Third Board Section =============================

• Galvanometer: Detects presence and direction of I

Which direction does the needle point?

• You MUST use the 100 kΩ resistor here!!

======================= Fourth Board Section =============================

• The coil:

• (Write the following on sketch!)
  • Draw needle pointing right or left
  • Bar magnet - move in/out halfway through coil!
• Draw sketches on worksheet

======================= Fifth Board Section =============================

• Exit quiz:
  • Find north pole of unknown magnet using Faraday/Lenz
    • A lab practical skill!
  • By yourself! No notes, no compass!
  • Same galvanometer, different coil and connection!

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©	St. Lawrence University	Department of Physics

Revised: 03 Mar 2023

Canton, NY 13617