What is meant by deflecting torque?
Deflecting torque is the torque which deflects the pointer on a calibrated scale according to the electrical quantity passing through the instrument. The deflecting torque causes moving system and hence pointer attached to it moves from zero position to indicate electrical quantity being measured on graduated scale.
What is current 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.
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.
What is C in current sensitivity?
Ans. Current sensitivity of a galvanometer is defined as the deflection produced in the galvanometer when a unit current flows through it. Where n is no of turns in the coil of galvanometer, B is Magnetic field around coil, A is Area of coil and c is restoring torque per unit twist.
What is current sensitivity and its unit?
Ratio of deflection produced in the galvanometer and the current flowing through it is called current sensitivity. Si=Iθ SI unit of current sensitivity Si is division/ampere or radian /ampere.
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 is SI unit of galvanometer?
The Ampere unit is its SI unit. …