WKM 500 Ω Coil Resistance Ballistic Galvanometer for Laboratories KTN275

WKM 500 Ω Coil Resistance Ballistic Galvanometer for Laboratories KTN275 is a sensitive and precise electrical instrument used in laboratories to measure and detect small electrical currents or charges. It operates on the principle of electromagnetic induction and provides a direct indication of the total charge passing through it over a short period, making it particularly useful for measuring transient or rapidly changing currents.

The main components of a ballistic galvanometer include:

Coil: The galvanometer has a coil of fine wire wound on a cylindrical bobbin. This coil is suspended between two jeweled bearings, allowing it to rotate freely in response to the current passing through it.

Magnet: A permanent magnet or an electromagnet is placed near the coil. When a current flows through the coil, it produces a magnetic field that interacts with the magnetic field of the magnet, resulting in a torque on the coil.

Pointer and Scale: The coil is connected to a pointer that moves along a calibrated scale. The scale is marked with angular displacement units, allowing users to measure the deflection of the pointer and determine the total charge passing through the galvanometer.

The working principle of the ballistic galvanometer involves two stages: charging and discharging. During charging, a current flows through the coil, causing it to rotate against the restoring torque of the suspension system. The deflection angle is proportional to the charge passing through the galvanometer. During discharging, the current stops, and the coil continues to rotate due to its inertia. The maximum deflection angle reached during discharging is related to the charge and can be measured on the scale.

Ballistic galvanometers are commonly used in laboratories for various applications:

Charge and Capacitance Measurement: The galvanometer can measure the charge on a capacitor or the current flowing in a charging or discharging capacitor.

Magnetic Field Detection: In some setups, ballistic galvanometers are used to detect changes in magnetic fields induced by moving charges or magnets.

Quality Factor (Q-Factor) Determination: The galvanometer can be used to measure the Q-factor of oscillating circuits, which is a measure of their energy loss.

Electromagnetic Radiation Detection: Ballistic galvanometers can be employed to detect electromagnetic radiation and radio waves.

Due to their high sensitivity and precision, ballistic galvanometers are used in specific experimental setups where accurate measurements of transient electrical phenomena are required. However, they have largely been replaced by more modern and electronic measurement devices in many applications. Nevertheless, their fundamental principles continue to be relevant in understanding the behavior of electrical circuits and electromagnetic interactions.

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