A sonometer is an apparatus used to study the transverse vibrations of stretched strings. It is in the form of a hollow wooden rectangular box. On the wooden rectangular box there are two bridges and a pulley at one end. A wire string is attached to one end of the wooden box, run over the bridges and pulley and carries a weight hanger.
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Viva Voce. A sonometer is an apparatus used to study the transverse vibrations of stretched strings. It is in the form of a hollow wooden rectangular box. On the wooden rectangular box there are two bridges and a pulley at one end. 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.
A sonometer is used to determine the frequency of alternating current. A step down transformer is used for the determination of frequency of A. The step down transformer reduces this voltage to 6 volts. The string wire of the sonometer is a non-magnetic metallic wire like brass or copper. 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.
When an alternating current of definite frequency passes through the wire there will be interaction between the magnetic field and the current carrying conductor. So a force will act on the conductor in a direction perpendicular to both the field and the direction of current. When A. Since the current flowing is alternating, the wire vibrates with a frequency equal to the frequency of A.
By adjusting the length of the vibrating wire segment, this frequency can be made equal to the natural frequency of the wire segment. Then the resonance takes place and the wire vibrates with maximum amplitude.
At this stage, the length of the wire segment is called the resonating length and it increases with increase in the mass of the suspended weights. 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. The graph should be a straight sloping line. Cite in Scientific Research:. Nedungadi P.
Cite this Simulator:. AC Sonometer. Our Objective: To determine the frequency of alternating current using a sonometer. The Theory: A sonometer is an apparatus used to study the transverse vibrations of stretched strings. Students will be able to derive the relationship between frequency of alternating current and the resonating length of the wire. Cite in Scientific Research: Nedungadi P. Cite this Simulator: amrita.
Retrieved 5 June , from amrita.
To determine the frequency of alternating current using a sonometer.
Aim To find the frequency of the AC mains with a sonometer. Theory Let the alternating current have frequency v so that the frequency of magnetisation of the electromagnet V E becomes 2v. Let a loaded stretched soft iron wire have resonant length l 1 with the electromagnet. The natural frequency of oscillation for a stretched wire of length L and mass m and tension T is. Alternative method.
To Find the Frequency of the AC Mains With a Sonometer
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 the pulley, and attached to a weight holder hanging below the pulley. 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.