What are the essential features of ballistic galvanometer?

What are the essential features of ballistic galvanometer?

A ballistic galvanometer is a type of sensitive galvanometer; commonly a mirror galvanometer. Unlike a current-measuring galvanometer, the moving part has a large moment of inertia, thus giving it a long oscillation period. It is really an integrator measuring the quantity of charge discharged through it.

What is the function of ballistic galvanometer and vibration galvanometer?

function. The ballistic galvanometer is designed to deflect its indicating needle (or mirror) in a way that is proportional to the total charge passing through its moving coil or to a voltage pulse of short duration. Any conventional galvanometer may also be employed as a ballistic type,…

What is the use of Fluxmeter?

Integrating Fluxmeters are used to measure total magnetic flux with a coil. Fluxmeters are often used when a total flux reading of a magnet is required and unlike Gaussmeters need a changing magnetic environment to support measurement.

What type of suspension Fibre is used in ballistic galvanometer?

The coil is suspended between the poles of a powerful horseshoe magnet by a suspension fibre of phosphor-bronze. A spring is attached to the other end of the coil. The current enters the coil through the fibre and leaves the coil through the spring.

What is the principle of ballistic galvanometer?

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. The galvanometer measures the majority of the charge passes through it in spite of current.

Is damping high or low in ballistic galvanometer?

When shunted by its CXDR, the galvanometer is said to be critically damped. With more resistance it is underdamped and with less it is overdamped. When the galvanometer is critically damped, it will make one swing and return slowly to its zero position. Search coil method of measuring magnetic flux.

Where is damping used?

Damping, in physics, restraining of vibratory motion, such as mechanical oscillations, noise, and alternating electric currents, by dissipation of energy. Unless a child keeps pumping a swing, its motion dies down because of damping. Shock absorbers in automobiles and carpet pads are examples of damping devices.

What is the difference between galvanometer and ballistic galvanometer?

The difference between galvanometer and ballistic galvanometer is that a galvanometer is used for measuring the small quantity of current that flows through the circuit. Whereas the ballistic galvanometer is used for measuring the quantity of charge that is displaced in a current of a short duration of time.

What is ballistic constant?

: a constant in ballistics that represents the efficiency of a projectile in overcoming air resistance.

What does ballistic mean?

1 : extremely and usually suddenly excited, upset, or angry : wild He went ballistic when he saw the dent in his car. and the crowd goes ballistic. 2 : of or relating to the science of the motion of projectiles in flight.

What are the types of galvanometer?

Some of the different types of galvanometer include Tangent galvanometer, Astatic galvanometer, Mirror galvanometer and Ballistic galvanometer. However, today the main type of galvanometer type that is used widely is the D’Arsonval/Weston type or the moving coil type.

What are the conditions for a moving coil galvanometer to be ballistic?

The conditions are : the moving coil must be wound on a metallic frame and eddy currents The oscillations of the coil die out instantaneously, the galvanometer is called dead beat galvanometer. When current is passed through a galvanometer, the coil oscillates about its mean position before it comes to rest.

What are the effect of vibration on galvanometer?

When an alternating current is passing through the moving element of the galvanometer, deflecting torque produces because of which the coil vibrates. If the vibration frequency of the moving element is equal to the frequency of the measurand current, the moving element vibrates with large amplitude.

Who invented ballistic galvanometer?

The earliest galvanometer was reported by Johann Schweigger at the University of Halle on 16 September 1820. André-Marie Ampère also contributed to its development. Early designs increased the effect of the magnetic field generated by the current by using multiple turns of wire.

What is the current sensitivity of a galvanometer?

The current sensitivity of a galvanometer is the deflection per unit current produced by the galvanometer. A high-sensitivity galvanometer can be used to measure very low values of currents. A low-sensitivity galvanometer can be used to measure high values of currents.

What is current sensitivity formula?

The sensitivity (i.e. current sensitivity) of a galvanometer is defined as the angle of deflection per unit current flowing through it. I = k n A B θ where θ is the angle of deflection , N is its turns, A is area, B is magnetic induction & k is the couple per unit twist.

Can a galvanometer be used to measure current?

The galvanometer is a very sensitive device. Hence, it may get damaged when a strong current is passed through the galvanometer. The galvanometer resistance is larger than the ammeter, if it is connected in series it will reduce the current flow through the circuit.

Is current A sensitivity?

Current sensitivity : It is defined as the deflection of coil per unit current flowing in it. Current Sensitivity Voltage sensitivity : It is defined on the deflection of coil per unit potential difference across its ends.

How can the current sensitivity increases?

So, sensitivity of the galvanometer can be increased either by increasing the number of turns (N), using strong magnets or increasing the area of the coil (A). So, the correct answer is that the sensitivity of a moving coil galvanometer can be increased by increasing the number of turns of the coil.

What is the difference between voltage sensitivity and current sensitivity?

Ans. Current sensitivity of a galvanometer is defined as the deflection produced in the galvanometer when a unit current flows through it. Voltage Sensitivity of a galvanometer is defined as the deflection produced in the galvanometer when a unit voltage is applied across two terminals.

Why does increasing the current sensitivity?

Current sensitivity can be increased by increasing the number of turns of the coil. Since voltage sensitivity decreases with increase in resistance of the coil, the effect of increase in number of turns is nullified in the case of voltage sensitivity. Hence, there is no increase in voltage sensitivity.

Is it necessary that increasing the current sensitivity will increase voltage sensitivity also?

Clearly the voltage sensitivity depends on current sensitivity and the resistance of galvanometer. If we increase current sensitivity then it is not certain that voltage sensitivity will be increased. Thus, the increase of current sensitivity does not imply the increases of voltage sensitivity.

How is figure of merit related to current?

Figure of merit of a galvanometer is the reciprocal of current sensitivity. The resistance of the coil of the galvanometer is called the resistance of the galvanometer.

How do you increase voltage sensitivity?

Current sensitivity or voltage sensitivity of a moving coil galvanometer can be increased by : (i) Increasing the number of turns in the galvanometer coil. (ii) Decreasing the torsion constant of the suspension fibre.

How do you increase the current sensitivity of the galvanometer?

Current sensitivity of a galvanometer is given by Is=nBAk where n is the no. of turns in the coil, A is the area of each turn of the coil, B is the strength of uniform magnetic field and k is the restoring torque per unit twist of suspension fibre in galvanometer. Is can be increased by increasing n and A.

What is current sensitivity What are the factors affecting it and working?

Thus, current sensitivity can be increased (i) by increasing the strength of magnetic field B or increasing the number of turns in the coil. (ii) by decreasing the torsional constant k of its suspension fibre.

What are the factors on which voltage sensitivity depends?

The strength of the magnetic field through which the coil is rotating, the number of turns in that coil, and the relative “stiffness” of the spring resisting the rotation are all factors influencing the ratio of the rotation angle to the coil current.

What are the factors on which sensitivity of galvanometer depends?

It depends on number of turns, coil area, restoring force per unit twist, and magnetic field.

Does voltage sensitivity depend on resistance?

Current sensitivity does not depend upon resistance(R), whereas voltage sensitivity does. Since voltage sensitivity decreases with increase in resistance of the coil, the effect of increase in number of turns is nullified in the case of voltage sensitivity. Hence, there is no increase in voltage sensitivity.