![]() ![]() The second coil acts just like a bar magnet. ![]() To confirm this, the magnet can be replaced with a second coil, and a current can be set up in this coil by connecting it to a battery. How can this be explained? It seems like a constant magnetic field does nothing to the coil, while a changing field causes a current to flow. Not only can a moving magnet cause a current to flow in the coil, the direction of the current depends on how the magnet is moved. When the magnet is moved one way (say, into the coil), the needle deflects one way when the magnet is moved the other way (say, out of the coil), the needle deflects the other way. If the magnet is moved, the galvanometer needle will deflect, showing that current is flowing through the coil.If the magnet is held stationary near, or even inside, the coil, no current will flow through the coil.There is no battery or power supply, so no current should flow. There are also some coils and magnets available in the undergraduate resource room - please feel free to use them.įirst, connect a coil of wire to a galvanometer, which is just a very sensitive device we can use to measure current in the coil. You'll be doing some more playing like this in one of the labs. We'll come back and investigate this quantitatively, but for now we can just play with magnets, magnetic fields, and coils of wire. This involves generating a voltage by changing the magnetic field that passes through a coil of wire. From now on we'll investigate the inter-connection between the two, starting with the concept of induced EMF. So far we've dealt with electricity and magnetism as separate topics. ![]()
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