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Aim
To find the frequency of AC meter with a sound meter

Equipment
One sonometer (with soft iron wire), one set of eight tuning fork, half kilo hanger, seven kilo kilogram weight, clamp, stand, rubber pad, paper rider, meter scale

Theory
Frequency of turn frequency frequency is V so that the frequency of magnetization of electromagnet (VE) becomes 2v
Give a loaded soft iron wire to the resonant length L1 with an electromagnet. Give the tuning of the frequency VT to the resonant length l2.