Two coils wound on separate bobbins, one having many turns of fine wire and the other with few turns of heavy wire. Demonstrate that induced potentials are produced either by movement of a permanent or electromagnet or by a change of current in one coil, fitted with insulated 4mm socket terminals and supplied with a soft iron core, outer coil is 12.5cm. long and 5cm dia.
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Jalandhar Cantt., Jalandhar, Punjab