An A.C sonometer is an apparatus by which the transverse vibrations of strings can be studied. It consists of The frequency is calculated using the equation. EXPERIMENT. AIM. To determine the frequency of alternating current using a sonometer E Set up for finding frequency of ac mains using a sonometer. Experiment: MELDE’S EXPERIMENT. Object: To determine frequency of A.C. mains using Sonometer. Apparatus: • A sonometer with a steel.

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Aim To find the frequency of the A. Give merits advantages of A. 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. A timing fork is metallic bar bent into U-shape and having a heavy steps attached to the middle of the bent portion.

A magnet magnetised by electric current, is called an electromagnet. The natural frequency of oscillation for a stretched wire of length L and mass m frequencyy tension T is.

The string wire of the sonometer is a non-magnetic metallic wire like brass or copper. Define wavelength for a stationary wave. When two identical waves of same frequency, amplitude travelling in a medium with same speed but in opposite directions superpose, they produce stationary waves.

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

Frequuency to time lag, the body polarity remains opposite to that of the main line. It is because the electromagnet is magnetised twice during one cycle of alternating current. Percentage Error Same as in Experiment When a body is vibrating with frequency of driving force, other than its natural frequency then it has forced vibrations.


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. If M is the mass and L is the length of the string then.

Theory A low alternating current passed directly through sonometer wire pf forces on it the frequency v nu of the A. Define root mean square or virtual or effective value of alternating current. One exprriment of A. When will the wire resonate?

To Find the Frequency of the AC Mains With a Sonometer

The graph between mass M of the suspended weights and square of the resonating length l2 by taking M along X-axis and l2 along Y-axis is drawn. For a given string under constant tension, the frequency of vibration is inversely proportional to the length of the string. 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.

What is a timing fork? Theory Let the alternating current have frequency v so that the frequency of magnetisation of the electromagnet V E becomes 2v.

What is function of a sounding board? What are forced vibrations? Then the resonance takes place and the wire vibrates with maximum amplitude. This will be the frequency of the stretched string. The distance between the centres of somometer successive crests or troughs is called the wavelength of a stationary wave. RD Sharma Class 12 Solutions. Students eonometer be able to derive the relationship between frequency of alternating current and the resonating length of the wire.


When a current carrying wire is placed in magnetic field then magnetic force act on the wire which tends to move it in a direction which is perpendicular to current and field. This phenomenon flow of electron on the surface of the conductoris called skin effect.

Then adjust the knife edges or the magnet to get the maximum vibration. What is the natural frequency of sonometer wire? C sonometer is an apparatus by which the transverse vibrations of strings can be studied.

Frequency Of AC Mains Using Sonometer

What are stationary waves? The law of mass may be put into two additional laws, for strings of circular cross-section, as given below.

A wire string is attached to one end of the wooden box, run over the bridges and pulley and carries a weight hanger at the free end as shown in figure below. The person touching the maisn is attracted. A sonometer is an apparatus used to study the transverse vibrations of stretched strings.