Experiment: MELDE’S EXPERIMENT. Object: To determine frequency of A.C. mains using Sonometer. Apparatus: • A sonometer with a steel. Theory Let the alternating current have frequency v so that the frequency of All precautions of sonometer experiment should be observed. EXPERIMENT. AIM. To determine the frequency of alternating current using a sonometer and an electromagnet. APPARATUS AND MATERIAL REQUIRED.

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C sonometer is an apparatus by which the transverse vibrations of strings can be studied.

It consists of two bridges, near the ends, one horse shoe magnet at the middle and at one end is a pulley. A string, often a copper wire, is fastened at one end that runs over the bridges and fxperiment pulley, and attached to a weight holder hanging below the pulley.

### To Find the Frequency of the AC Mains With a Sonometer – Learn CBSE

Weights can be added to the holder to produce tension on the wire and the bridges can be moved to change the length of the vibrating section of the string. Every object has a natural frequency of vibration.

If kinetic energy is applied to an object at a rate that matches its natural frequency, resonance occurs and the object vibrates. In this experiment a small current, produced by a signal generator, causes the sonometer wire to move up and down due to interaction with the magnetic field of a U-shaped magnet.

When the rate of movement due to the current matches the fundamental frequency of the wire, resonance occurs causing noticeable vibration.

To determine the frequency of a string first take a copper string and connect it to an A. Then adjust the knife edges or the magnet to get the maximum vibration. This will be the frequency of the stretched string.

## To Find the Frequency of the AC Mains With a Sonometer

For a given string under constant tension, the frequency of vibration is inversely proportional to the length of the string. For a given string of constant length, the frequency of vibration is directly proportional to the square root of the tension.

For a string of constant length and under sononeter constant tension, the frequency of vibration is inversely proportional expeirment the square root of its mass per unit length. If M is the mass and L is the length of the string then.

## Materials required:

The law of mass may be put into two additional laws, for strings of circular cross-section, as given below. For a string of a given material and length and under a constant tension, the frequency is inversely proportional to its diameter. For a string of a given length and diameter and under constant tension, the frequency is inversely proportional to the square root of the density of the material of the string.

What is an A. Frequency of vibration of a stretched string: Derivation of the equation: Retrieved 31 Decemberfrom vlab.