The objectives of this laboratory exercise are to: use iron filings and a compass to map the magnetic field of bar magnet and a current-carrying coil (with and without an iron core). qualitatively verify Faraday's law and Lenz's law by inducing current flows in wire coils. show that a changing magnetic flux in a coil induces an EMF in a second magnetically linked coil. use a function generator to demonstrate that for two magnetically linked coils, the induced EMF is the differential of the supplied EMF. Apparatus demos: DEM05, DEM38, DEM24.1, DEM33, DEM44, DEM44A, & DEM80 demos: bar magnet field mapped w/compasses, circle of 20 compasses Agilent DC power supply (E3649A), Fluke 45 digital multimeter galvanometer magnets (bar and cow), green tape magnetic compass Gilley coil and cardboard insert model transformer with 200 & 400 turn coils tap switch & leads iron filings, iron (full and half), aluminum and copper bars Part A: Magnetic Field Mapping Earth can be imagined as containing a bar magnet. On which continent would the field lines from the north end of this magnet emerge?

re 2) Part B: Qualitative Verification of Faraday and Lenz's Laws In an experiment, an EMF is induced in a stationary coil by a magnet moving at 20 cm/s. State what would happen (half, double etc.) to the EMF if: a. a magnet of half the strength (B/2) was moved at 20 cm/s Answer: b. a magnet of twice the strength (2B) was moved at 10 cm/s Answer: c. a magnet of strength (B) was moved at 10 cm/s Answer: d. the number of turns on the coil was doubled Answer: e. the magnet was stationary, and the coil was moved at 20 cm/s Answer: