Additional Info

• ID Code: K2-04
• Purpose: Shows that the induced current is proportional to the number of turns in the secondary coil
• Description: Three coils are connected in series with a projection galvanometer on an overhead projector. A bar magnet is thrust through one of the coils, inducing current in the coil which is shown on the meter. Three coils are included on the device: 20, 40, and 80 turns; the bigger the coil the greater the induced current.

  Have students try to predict the relationship between coil size and current strength before performing the experiment.

• Availability: Available
• Loc codes: K2, J5a