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EXPERIMENT - NCERT

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EXPERIMENTEXPERIMENTEXPERIMENTEXPERIMENT EXPERIMENTAIMTo determine the frequency of alternating current using a sonometerand an AND MATERIAL REQUIREDA sonometer with a soft iron wire stretched over it, an electromagnet,a step-down transformer, slotted 1/2 kg weights hanger, a physicalbalance, two sharp edge wedges and a weight frequency n of the fundamental mode of vibration of a stretchedstring, fixed at two ends, is given by12Tnl m=Here l is the length of the vibrating string, T is the tension in the wireand m is its mass per unit an alternating current is passed in the coil of the electromagnet, themagnetisation produced in the core is proportional to instantaneousvalue of the current .

2. AC frequency may not be stable. D ISCUSSION 1. The frequency of alternating current is half that of the frequency of the vibrating string. 2. Sonometer wire is made of soft iron for better results. S ELF ASSESSMENT 1. How is ac different from dc? 2. What is the meaning of frequency of ac? 3. How does the wire vibrate? Identify and explain ...

  Current, Alternating, Alternating current

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