Faraday's Law (Creating current with magnets)
Topics and Files
E&M Topic
- Electromagnetic induction; Faraday's Law
DataStudio File
- 79 Induction - Magnet.ds
Equipment List
Introduction
The purpose of this activity is to measure the potential difference induced in a coil of wire by a bar magnet dropping through the center of the coil. Use the voltage sensor to measure the induced potential. Use DataStudio to record and display the data.Background
When electricity is passed through a conducting wire, a magnetic field can be detected near the wire. Micheal Faraday was one of the first scientists to reverse the process. The essence of his work is decribed in the following statement.- A changing magntic field in the presence of a conductor induces a voltage in the conductor.
( 1 )
ε = −N
Δφ |
Δt |
Δφ |
Δt |
Figure 1
( 2 )
εΔt = −NΔφ
Caution:
Note: During this experiment, keep the magnet away from the computer and from computer disks.
Note: During this experiment, keep the magnet away from the computer and from computer disks.