Sensitivity of galvanometer is defined asthe current in micro ampere required to consume one millimeterdeflection on a scale placed 1m away from the mirror. TO INCREASESENSITIVITY OF GALVANOMETER. Keeping this in consideration, on what factors sensitivity of galvanometer depends?
State two factors on which the sensitivityof a moving coil galvanometer depends. Thesensitivity of a moving coil galvanometer dependsupon: (a) The value of n, i.e., number of turns.
Subsequently, question is, how do you make a galvanometer more sensitive? The sensitivity of Moving Coil Galvanometer increasesby:
- Increasing the no. of turns and the area of the coil,
- Increasing the magnetic induction and.
- Decreasing the couple per unit twist of the suspensionfibre.
Just so, what is the current sensitivity?
Current sensitivity : It is defined as thedeflection of coil per unit current flowing in it.Current Sensitivity, Voltage sensitivity : It isdefined on the deflection of coil per unit potential differenceacross its ends.
What is current sensitivity and voltage sensitivity of a galvanometer?
Current Sensitivity: So, current sensitivityof a galvanometer can be increased by increasing the value ofB, N and A. It can be decreased by decreasing the value of k.Voltage Sensitivity: The deflection of galvanometerper unit voltage is called voltage sensitivity of agalvanometer.
Related Question Answers
What is meant by current sensitivity?
Current sensitivity is the measure ofresponsiveness of any instrument to the change of currentthrough it. It is defined as 'The deflection produced for aunit current flowing through an instrument(galvanometer)'. What is the principle of ballistic galvanometer?
The working principle of the ballisticgalvanometer is very simple. It depends on the deflection ofthe coil which is directly proportional to the charge passesthrough it. The galvanometer measures the majority of thecharge passes through it in spite of current. What is current sensitivity of ballistic galvanometer?
The current sensitivity of a moving coilgalvanometer is 5 div/mA and its voltage sensitivityis 20 div/v (angular deflection per unit voltage isapplied). In which conditions is the galvanometer said to be more sensitive?
A galvanometer is said to be verysensitive if it gives large deflection even when a smallcurrent is passed through it. What is the half deflection method?
A method of finding the internal resistance of acell when the value is known to be high. A second cell, agalvanometer and a resistance are connected in series with the cellunder test, and the value of the resistance required to give agalvanometer. deflection of half the value obtainedwith the cell alone is found. What are the factors governing the sensitivity of a moving coil galvanometer?
The strength of the magnetic field through which thecoil is rotating, the number of turns in that coil,and the relative "stiffness" of the spring resisting the rotationare all factors influencing the ratio of the rotation angleto the coil current. How is current sensitivity of a galvanometer increased?
Current sensitivity of a galvanometer is definedas deflection per unit current, ϕ I = N A B k.Current sensitivity can be increased byincreasing the number of turns of the coil. However, thisincreases the resistance of the coil also(R is proportionalto length of conductor). How do you increase the deflection of a galvanometer?
- Increase the turns on the coil. - Increase the electromagneticfield strength that produces the torque on the movement, deflectingthe pointer.
- Use a more powerful magnet. - Increases the magnetic fieldstrength allowing more torque on the movement.
- Use a smaller taut band or hair spring. -
What is current and voltage sensitivity?
Current sensitivity is the measure ofresponsiveness of any instrument to the change of currentthrough it. Voltage sensitivity is the measure ofresponsiveness of any instrument to the change of appliedvoltage across it. What is K in current sensitivity?
0. Current sensitivity of a galvanometer isdefined as deflection per unit current, ϕI=NABk.Here, ϕ is the angular deflection, k is the torsionalconstant of the spring, and NAB is the magnetic torque per unitcurrent produced in the galvanometer (MCG). What is charge sensitivity?
Charge sensitivity is the charge generatedin the PZT for every 'g' of input acceleration. The unit forcharge sensitivity is pF/ g. Here pF is picoFarad. What is the unit of figure of merit?
Ampere
What is voltage sensitivity?
The voltage sensitivity can be defined as thedeflection produced in the Galvanometer when a unit voltageacross its coil. ∅/V= ∅/IR———————- (2) To Justify,Increasing Current Sensitivity may not Necessarily Increasethe Voltage Sensitivity, let double the number of turns i.eN → 2N, then current sensitivity. What is voltmeter sensitivity?
Voltmeter Sensitivity. voltmeter is givenin ohms per volt. It is determined by dividing the sum of theresistance of the meter (Rm), plus the series resistance (Rs), bythe full-scale reading in volts. What is the basic principle of moving coil galvanometer?
Principle: When a current carrying coil issuspended in a uniform magnetic field it is acted upon by a torque.Under the action of this torque, the coil rotates and thedeflection in the coil in a moving coil galvanometeris directly proportional to the current flowing through thecoil. What do you mean by current sensitivity of a moving coil galvanometer?
Current sensitivity of galvanometer is thedeflection produced for a unit current flowing through it, Asensitive galvanometer should have a large deflection evenfor small amount of currents flowing through the circuit. Its valuedepends upon: The number of turns in the coil. How can we convert galvanometer into voltmeter?
Conversion of a Galvanometer into aVoltmeter A galvanometer can be converted intovoltmeter by connecting a high resistance called multiplier inseries to the galvanometer. This equation gives the value ofresistance R, which connected in series to the galvanometer,is converted into a voltmeter of range 0 – Vvolts. Can a galvanometer measure AC current?
A 'galvanometer' is simply an instrument thatdetects and measures small currents; 'moving coil'describes its operating principle. In the case of a multimeter, arectifier circuit is incorporated so that it can be used tomeasure a.c. currents and voltages. Can a galvanometer be used to measure current?
Most of the Moving coil galvanometers, used tomeasure current (Ammeter), voltage (Voltmeter) orindicator of current in the circuit (galvanometer)are of type “pivoted type moving coilgalvanometer”. It must admit the current to bemeasured through it. This is possible only when it is inseries in the circuit. Why Radial magnetic field is used in galvanometer?
The uniform radial magnetic field keeps the planeof the coil always parallel to the direction of the magneticfield . The Radial field provides strong magneticin which the coil of the galvanometer is placed.It increasesthe sensitivity of the moving coilgalvanometer. What are the main parts of tangent galvanometer?
A tangent galvanometer consists of a coil ofinsulated copper wire wound on a circular non-magnetic frame. Theframe is mounted vertically on a horizontal base provided withlevelling screws. The coil can be rotated on a vertical axispassing through its centre. What is tangent law in magnetism?
Tangent Law of Magnetism: The lawstates that, if a magnetic field 'B' is applied at rightangles to the horizontal component of the earth's field BH , theneedle comes to equilibrium at an angle `theta` to themagnetic meridian such that, tan`theta` = `(B)/(Bh)`. Why does the galvanometer deflect in the opposite direction?
Move the rod in the opposite direction and thegalvanometer needle will deflect in the oppositedirection. The induced current is in such a direction asto produce a magnetic flux that opposes the change in the magneticfield caused by sliding the conductor. Why galvanometer is not used to measure current?
State two reasons why a galvanometer cannot be used as such to measure current in agiven circuit. Answer: (ii) A galvanometer is a verysensitive device, it gives a full scale deflection for thecurrent of the order of microampere, hence if connected assuch it will not measure current of the order ofampere. What is difference between galvanometer and ammeter?
The most significant difference between thegalvanometer and ammeter is that the galvanometershow both the direction and the magnitude of the current, whereasthe ammeter only shows the magnitude of the current. And ifthe resistance is connected in series with a galvanometer,then it is used as a voltmeter. What is radial magnetic field?
A magnetic field , in which the plane of the coilin all positions remains parallel to the direction of magneticfield is called radial magnetic field . In a moving coilgalvanometer, the magnetic field is made radial byusing a field magnet with concave poles. How does a ballistic galvanometer work?
The working principle of the ballisticgalvanometer is very simple. It depends on the deflection ofthe coil which is directly proportional to the charge passesthrough it. The galvanometer measures the majority of thecharge passes through it in spite of current. 
