Now let\'s look at a slightly different situation. Let\'s consider a conductive

Question

Now let's look at a slightly different situation. Let's consider a conductive bar with a current flowing as in the diagram to the right. The current is composed of moving charges which would be subject to the Lorentz force when in a magnetic field. Describe the result of that force on the charges in the conductor. If charges accumulate, they will produce a voltage which could be measured. Remember where on a conductor the charges will accumulate. When there is a complete circuit, something completely different happens. Let's consider the following situations, keeping the above results in mind. We are looking for qualitative descriptions only here A long conducting loop is moved through a region a uniform magnetic field. The magnetic field is zero outside that region. Describe the motion of the charges in the loop as it enters, then leaves the magnetic field. Now suppose we have a square conducting loop rotating about an axis which is perpendicular to the magnetic field. Describe the resulting current in the loop as it rotates. Further results were discovered by Michael Faraday in his work with magnets and coils. Discovering his unified treatment of these results will induce us to consider our ideas in flux.

Explanation / Answer

1. The force on the wire is toward the top of the diagram. The charges in the wire accumulate towards the upper side of the wire.

2. When the loop enters the magnetic field, the current flows clockwise. When the loop is entirely inside the magnetic field, there is no currrent. When the loop exits the field, the current flows counterclockwise. If the loop rotates in the field, the current flows counterclockwise then clockwise alternatively with every 180 degree rotation of the loop.

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