A thin steel rod (Called Vibrator) is clamped at one end passes through a small solenoid The rod is slightly flattened at the free end and a hole is drilled in it so that a string can be tied through it the solenoid is connected to A.C mains through a suitable lamp resistance A permanent horse shoe magnet is mounted on the base board and a steel rod passes between them the thin rod is magnetized longitudinally the

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