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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Once the area of vibrating body increases the amplitude of vibration of the board wire system also increases. What are nodes and antinodes? A sonometer is used to determine the frequency of alternating current. Maons sonometer is an apparatus by which the transverse vibrations of strings can be studied.

The string wire of the sonometer is a non-magnetic metallic wire like brass or copper. Give demerits disadvantages of A. What is skin effect? RD Sharma Class 12 Solutions. The graph should be a straight sloping line. The frequency is 50 hertz Hz [hertz means cycles per sec. 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.

If Frewuency is the mass frequebcy L is the length of the string then.

To make the inside air in communication with external air. Derivation of the equation: At this stage, the length of the wire segment is called the resonating length and it increases with slnometer in the mass of the suspended weights. It is twice the frequency of the alternating current.


So a force will act on the conductor in a direction perpendicular to both the field and the direction of current. Why does the string of the sonometer vibrate? 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.

The current is A.

What is a timing fork? Students will be able to derive the relationship between frequency of alternating current and the resonating length of the wire.

What is an electromagnet? By adjusting the length of the vibrating wire segment, this frequency can be made equal to the natural frequency of the wire segment. Apparatus Same as in Experiment 8 except a separate horse shoe magnet and a separate step down transformer. What is the unit of frequency of A. On touching it, the polarity of the body of the person also changes. What is frequency of alternating current supplied to us in our houses?

Frequency of vibration of a stretched string: Nodes are the points of zero amplitude and antinodes are points of maximum amplitude. For an alternating current having maximum peak value 70.

A timing fork is metallic bar bent into U-shape and having a heavy steps attached to the middle of the bent portion.

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

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. 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.


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. In very high frequency A. When a body is vibrating with frequency of driving force, other than its natural frequency then it has forced vibrations.

Our Objective:

A current having magnitude changing between maximum and zero and same direction, is called unidirectional current. The vibrations are called resonant vibrations. 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. How does the wire begin to vibrate in this case? This tendency increases with the frequency of A.

To determine the frequency of a string first take a copper string and connect it to an A.

It is because the electromagnet is magnetised twice during one cycle of alternating current. On the wooden rectangular box there are two bridges and a pulley at one end.

It consists of two sonoemter, near the ends, one horse shoe magnet at the middle and at one end is a pulley. In this experiment a small current, produced by a signal generator, causes the sonometer ecperiment to move up and down due to interaction with the magnetic field of a U-shaped magnet.