Northwestern Physics Demos                                 Go back to MAGNETISM 
DCS# 5H40.35NWU#  E-66Location:   ?
title: RAIL GUN
aka: forces on currents, jumping wire

A special magnet (pole on the long side) is placed between two brass bars.  A current source is attached to the bars and a brass rod is placed between them.   The current through the rod is acted on by the magnetic field and caused to roll across the overhead projector.

    Given the direction of travel and the polarity of the applied voltage, in which way is the magnetic field directed?

    Given the magnetic field is upward, and the current flows from left to right, which way will the bar roll?
overall set uppix of set up