Description: "A certain earthquake detector consists of a very large magnet supported by springs. The magnet is housed in a box that is firmly attached to the earth and lined with coils of wire which are attached to the recording equipment. The output of the recording equipment is a seismograph which is a chart that shows the movement of the ground."How is the direction of the Earth鈥檚 motion inferred?The magnet is massive and only loosely conencted to the house with springs. It therefore does not respond immediately to the movement of the house. The coils are connected directly to the house and therefore move with the house. This way the coils move with respect to the magnet if they are moved by an earthquake. This movement will cause a change of the flux through the coils and therefore a change of the electric tension.
How the direction is inferred one can only tell if the precise configuration is known. Most likely you will need three coils for three directions.
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