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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Then adjust the knife edges or the magnet to get the maximum vibration. Aim To find the frequency of the AC mains with a sonometer.

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.

Apparatus Same as in Experiment 8 except a separate experjment shoe magnet and a separate step down transformer. A string, often a copper wire, is fastened at one end that runs over the bridges and the pulley, a attached to a weight holder hanging below the pulley.

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

When an alternating current of definite frequency passes through the wire there will be interaction between the magnetic field and the current carrying conductor. It is because the electromagnet is magnetised twice during one cycle of alternating current. When the rate of movement due to the current matches the fundamental frequency of the wire, resonance occurs causing noticeable vibration. A horse shoe magnet is placed at the middle of the sonometer wire so that the magnetic field is applied perpendicular to the sonometer wire in a horizontal plane.


For a string of a given material and length and under a constant tension, the frequency is inversely proportional to its diameter. When the natural frequency of a particle is equal to the frequency of driving force, then resonance takes place. Select the type of AC supply from the drop down list. To make the inside air in communication with external air.

A step down transformer fxperiment used for the determination of frequency of A. Then the resonance takes place and the wire vibrates with maximum amplitude.

Frequency Of AC Mains Using Sonometer

It consists of two bridges, near the ends, one horse shoe magnet at the middle and at one end is a pulley. C sonometer is an apparatus by which the osnometer vibrations of strings can be studied.

Change the position of bridge B using the slider. When the vibrating tuning fork is placed on it, it is set into forced vibrations.

Once the area of vibrating body increases the amplitude of vibration of the board wire system also increases. Steady current is the current whose magnitude and direction does not change with time. Unit of frequency of A. For a given string of constant length, the frequency of vibration is directly proportional to the square root of the tension.


What are nodes and antinodes? By knowing the linear density, m, of the wire, the frequency of A. Give merits advantages of A. A light paper rider is placed on the wire between the bridges of the sonometer. In exoeriment 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.

AC Sonometer (Procedure) : Class 12 : Physics : Amrita Online Lab

The length of the wire between the two bridges is adjusted till the wire vibrates with maximum amplitude. RD Sharma Class 12 Solutions. So a force will act on the conductor in a direction perpendicular to both the field and the direction of current. This is called the resonating length l. To determine the frequency of alternating current using a sonometer.

It is found that in an alternating current, the tendency of the moving electrons is to drift towards the surface of the conductor while moving along its axis. Change the position of bridge A using the slider.

Attach a weight hanger at the free end of the string which passes over the pulley.