J6-21: MAGNETIC FIELD IN GAP OF ELECTROMAGNET
- ID Code: J6-21
- Purpose: Semi-quantitatively measure the magnetic field in the air gap of a magnet.
- Description:
Using a magnet with a square yoke, separate the top yoke member, creating two gaps in the yoke. Into one gap place a small search coil; into the other place a non-magnetic shim. As the gap length h is increased the field B(gap) decreases:
B(gap) = mu(0) N i / h, where N is the number of turns and i is the current in the coil.
- Availability: Available
- References: http://www.physics.umd.edu/deptinfo/facilities/lecdem/services/refs/refsj.htm#J6-21