To determine the frequency of A.C. mains with a sonometer using non-magnetic wire. :
AP-721B solenoid electromagnet with AC mains-transformer for frequency-of-ac-mains-by-sonometer Abron Sound
Apparatus Required : Sonometer with non-magnetic wire (brass wire) stretched over it, step down transformer of 6-8 volts, horse shoe magnet, meter scale, screw gauge and half kg weights
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