The current sensitivity of a galvanometer can be increased by :
(A) decreasing the number of turns
(B) increasing the magnetic field
(C) decreasing the area of the coil
(D) decreasing the torsional constant of the spring
Choose the most appropriate answer from the options given below :
(B) and (C) only
(A) and (C) only
(C) and (D) only
(B) and (D) only
Get Answer
Current
where, torsional constant and
magnetic fixed
In a moving coil galvanometer, the deflection of the coil is related to the elecrical current by the relation
The coil of a moving coil galvanometer is wound over a metal frame in order to
reduce hysteresis
increase sensitivity
increase moment of inertia
provide electromagnetic damping
The coil of a moving coil galvanometer is wound over metallic frame to provide electromagnetic damping so it becomes dead beat galvanometer
To know the resistance of a galvanometer by half deflection method, a battery of emf and resistance is used to deflect the galvanometer by angle . If a shunt of resistance is needed to get half deflection then and related by the equation:
A galvanometer is shunted by a resistance of . The percentage of the total current which passes through the galvanometer is :
We have,
. So,
A moving coil galvanometer has a resistance of . In order to send only of the main current through this galvanometer, the resistance of the required shunt is
In an ammeter of main current passes through the galvanometer. If resistance of galvanometer is , the resistance of ammeter will be :
A galvanometer of resistance, is shunted by a resistance ohm. To keep the main current in the circuit unchanged, the resistance to be put in series with the galvanometer is
To keep the main current in the circuit unchanged, the resistance of the galvanometer should be equal to the net resistance
.
The resistance of an ammeter is and its scale is graduated for a current upto 100 amps. After an additional shunt has been connected to this ammeter it becomes possible to measure currents upto 750 amperes by this meter. The value of shunt-resistance is
We know
The current sensitivity of a galvanometer increases by . If its resistance also increases by , the voltage sensitivity will
decrease by
increased by
Given,
?
change
Decrease by .
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