Ballistic galvanometer. Galvanometer damping. Search coil method of measuring magnetic flux. Permeability. Magnetization curve. Rowland ring. Hysteresis. The principle of Moving Coil Galvanometer: When a current carrying coil is suspended in a uniform magnetic field it is acted upon by a torque. here u can got the deatils construction of ballistic galvanometer and some Circuit diagram to finding the absolute capacity of a capacitor
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The galvanometer which is used for estimating the quantity of charge flow through it is called the ballistic galvanometer.
Ballistic galvanometer – Wikipedia
The working principle of the ballistic galvanometer is very simple. It depends on the deflection of the coil which is directly proportional to the charge passes through it. Balliistic galvanometer measures the majority of the charge passes through it in spite of current.
The ballistic galvanometer consists coil of copper ballitic which is wound on the non-conducting frame of the galvanometer. The phosphorous bronze suspends the coil between the north and south poles of a magnet. For increasing the magnetic flux the iron core places within the coil.
The lower portion of the coil connects with the spring. This spring provides the restoring torque to the coil. When the charge passes through the galvanometer, their coil starts moving and gets an impulse. The impulse of the coil is proportional to the charges passes through it. The actual reading of the galvanometer achieves by using the coil having a high moment of inertia.
Moving Coil Galvanometer (M.C.G.)
The moment of inertia means the body oppose the angular movement. If the coil has a high moment of inertia, then their oscillations are large. Thus, accurate reading is obtained. Consider the rectangular coil having N number of turns placed in a uniform magnetic field. The area of the coil is given as. When the current passes through the coil, the torque acts on it. The baklistic expression determines gapvanometer magnitude of the torque.
If the current passing through the coil for t seconds, the expression becomes.
The q be the total charge passes through the coil. The expression gives the angular momentum of the coil. The angular momentum of the coil is equal to the force acting on the coil. Thus from equation 4 and 5we get.
The resorting torque of the coil is equal to their deflection. The periodic oscillation of the coil is given as. By multiplying the equation 7 from the above equation we get.
The calibration of the galvanometer is the process of determining its constant value by the help of the practical experiments. Ballistlc following are the methods used for determining the constant of the ballistic galvanometer. The charging and discharging of the capacitor gives the values of the ballistic galvanometer constant.
The circuit arrangement for the calibration of a ballistic galvanometer using the capacitor is shown in the figure below.
What is Ballistic Galvanometer? – Definition, Construction, Theory & Calibration – Circuit Globe
When the switch S connects to terminal 2 then the capacitor becomes charged. Similarly, when the switch connects to terminal 1, then the capacitor becomes discharges through the resistor R, connected in series with the ballistic galvanometer. The formula calculates constant of the galvanometer.
The constant of the ballistic galvanometer determines digram the mutual inductance between the coils.
The arrangement of the ballistic galvanometer requires two coils; primary and secondary. The primary coil diagtam energised by knowing voltage source.
Because of the mutual induction, the current induces in the secondary circuit.
And this current is used for the calibration of the ballistic ba,listic. Your email address will not be published. Circuit Globe All about Electrical and Electronics.
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