Northwestern Physics Demos                                 Go back to MAGNETISM   
DCS# 5K40.10NWU#  E-18Location:    
title: Commutator

A pivotted coil of wire is placed between the poles of a magnet.  Current is supplied by a power supply through a commutator through an ammeter.  With a slight nudge, the wire coil will spin.

    What can be done to make the coil turn faster?
    Why is there less current when the coil is spinning fastest?

pix of set up