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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Let a tuning fork of frequency V T have resonant length l 2.

Precautions Same as in Experiment What is the unit of frequency of A. 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.

At this stage, the length of the wire segment is called the resonating length and it increases sonomdter increase in the mass of the suspended weights. Therefore, a sonometer is an instrument which measures the frequency of sound. Give merits advantages of A.

To Find the Frequency of the AC Mains With a Sonometer

What is the function of holes in the sonometer box? Since the current flowing is alternating, the wire vibrates with a frequency equal to the frequency of A. Why does the string of the sonometer vibrate? On touching it, the polarity of the body of the person also changes. What are stationary waves? What is function of a sounding board? The string wire of the sonometer is a non-magnetic metallic wire like brass or copper. A sonometer is used to determine the frequency of alternating current.

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.


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. What are natural vibrations?

Theory A low alternating current passed directly through sonometer wire imposes forces on it the frequency v nu of the A. For a string of constant length and under a constant tension, the frequency of vibration is inversely proportional to the square root of its mass per unit length. Retrieved 1 Januaryfrom amrita. A current having changing magnitude but not becoming zero and same direction, is called fluctuating current.

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 a body is vibrating with its own natural way then it has natural vibrations. Why is frequency of magnetisation of electromagnet double of that of the alternating current? What is an A. When the rate of movement due to the current matches the fundamental frequency of the wire, resonance occurs causing noticeable vibration.

Nodes are the points of zero amplitude and antinodes are points of maximum amplitude.

A current having magnitude changing between maximum and zero and same direction, is called unidirectional current. The step down transformer reduces this voltage to 6 volts.

When will the wire resonate? Unit of frequency of A. When the frequency of A. What donometer an electromagnet? What is unidirectional current? It is in the form of a hollow wooden rectangular box. Students will be able to derive the relationship between frequency of alternating current and the resonating length of sonomteer wire.

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

Give demerits disadvantages of A. What is skin effect? Apparatus Same as in Experiment 8 except a separate horse shoe magnet and a separate step down transformer. So a force will act usinf the conductor in a direction perpendicular to both the field and the direction of current. A step down transformer is used for the determination of frequency of A.


Our Objective:

What is the natural frequency of sonometer wire? The law of mass may be put into two additional laws, for strings of circular cross-section, as given below. It is because the electromagnet is magnetised twice during one cycle of alternating current. RD Sharma Class 12 Solutions. 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.

For an alternating current having maximum peak value 70. Once the area of vibrating body increases the amplitude of vibration of the board wire system also increases.

The distance between frequenfy centres of two successive crests or troughs is called the wavelength of a stationary wave. How does the wire begin to vibrate in this case? For a given string of constant length, the frequency of vibration is directly maibs to the square root of the tension.

Then the resonance takes place and the wire vibrates with maximum amplitude. Theory Let the alternating current have frequency v so that the frequency of magnetisation of the electromagnet V E becomes 2v. Aim To find the frequency of the AC mains with a sonometer.