Determine Frequency of A.C. Waves Using Sonometer-Basic Electrical Engineering-Lab Mannual, Exercises of Electrical Engineering

Download Determine Frequency of A.C. Waves Using Sonometer-Basic Electrical Engineering-Lab Mannual and more Exercises Electrical Engineering in PDF only on Docsity! Experiment No. Phy-6 Object: To determine frequency of A.C. mains using sonometer. Apparatus: • A sonometer with a steel wire of unknown diameter. • Electromagnet • A step down transformer(220V to 6V or 12 V) • Rheostat • Hanger with slotted weights of 1Kg each • Mete Rod • Two wedges Formula used: 0 1 4 Mg f l m = Sonometer Procedure: i. To perform this experiment usually a sonometer is used in which an electromagnet is fitted in the middle. Connect one end of a steel wire of uniform diameter to peg and connect other end to hanger after passing it over two wedges and a frictionless pulley. ii. Put suitable slotted weights in hanger so that the wire may remain in tension without any bends or kinks iii. Place one wedge on one side and the other wedge on other side of electromagnet at nearly equal distances from there. Also put a small rider of paper on the wire above the electromagnet. iv. Switch on circuit of electromagnet. The steel wire will begin to vibrate Adjust position of wedges by moving them slowly until the rider flies off. Then amplitude of vibration will be maximum and transverse stationary waves will be set up in the segment of wire between wedges with nodes at wedges and anti-notes in the middle (above the electromagnet.) v. Measure length of segment of wire between wedges by meter rod twice by repeating step (iv) and find its mean value ‘l’. Docsity.com