Galvanometer Principle (G10) [5H50.30]
Magnetic FIelds - Forces on Current
Demonstrates torque on a magnetic dipole in an external, constant magnetic field. This is the principle upon which galvanometers work.
https://www.youtube.com/watch?v=Jnc0OHVTA-U
A large Helmholtz coil is connected to 125 VDC and produces a uniform ‘B' field between its coils. A separate coil is suspended within this field. Make sure to remove the cardboard brace that prevents the smaller coil from rotating using the thumbscrew. A 6V current is run through the smaller hanging coil using a small knife switch, either clockwise or counterclockwise. This creates a magnetic dipole pointing left or right. This is the principle of a galvanometer. The coil’s direction and magnitude of rotation can be varied by the polarity and amount of DC current applied to it.
Tags: 8.02, Magnetic fields, magnetic dipole, torque