To Determine the Current Sensitivity & Ballistic Constant K of Ballistic Galvanometer by Steady Deflection method for Physics Lab Experiments

Ballistic Galvanometer is a specialized measuring instrument designed to measure the total quantity of electric charge passing through a circuit during a brief transient pulse. Unlike a conventional galvanometer that measures continuous current, a ballistic galvanometer measures charge by observing the first deflection or first throw of its moving coil.

The instrument is designed with a moving coil having a large moment of inertia and very low damping. These features ensure that the first throw of the coil is directly proportional to the total electric charge passing through it.

Ballistic Galvanometer is widely used in physics and electrical engineering laboratories for charge measurement, calibration experiments, and determination of high resistance using the leakage method.

Physics Lab Experiments Setup from Atico Exports.

• Measurement of Electric Charge
• Calibration Using a Known Capacitor
• Determination of High Resistance by Leakage Method
• Study of Charge Sensitivity
• Study of Electromagnetic Torque
• Study of Angular Momentum and Damping

Working Principle :

• Measures the Total Electric Charge Passing Through the Coil
• Operates on the Principle of Electromagnetic Torque
• First Throw is Proportional to the Total Charge
• Large Moment of Inertia Ensures Slow Coil Movement
• Very Low Damping Provides Accurate First Deflection Measurement

Charge Relation :

• Q = k × θ₀

Where :

• Q = Total Electric Charge
• k = Ballistic Galvanometer Constant
• θ₀ = First Throw or Maximum Initial Deflection

Suitable Experiments :

• Measurement of Charge on a Capacitor
• Determination of Ballistic Galvanometer Constant
• Measurement of High Resistance Using Leakage Method
• Determination of Charge Sensitivity

Usage / Application :

• Physics Laboratory
• Electrical Engineering Laboratory
• Educational and Experimental Applications

• High Sensitivity for Small Electric Charge Measurement
• Moving Coil with Large Moment of Inertia
• Very Low Damping
• Accurate Measurement of Transient Charge Pulses
• First Deflection Proportional to Electric Charge
• Suitable for Laboratory Experiments and Demonstrations