Question

The following apparatus is available in the laboratory :- Battery : adjustable to 0 to 6 V Resistors : 3 ohm and 6 ohm Ammeters : A1 of range 0 to 5 A; Least count 0.25 A A2 of range 0 to 3 A; Least count 0.1 A Voltmeters : V1 of range 0 to 10 V; Least count 0.5 V V2 of range 0 to 5V; Least count 0.1 V For the experiment to find the equivalent resistance of the parallel combination of the two given resistors, the best choice would be (i.) A1 and V1 (ii.) A1 and V2 (iii.) A2 and V1 (iv.) A2 and V2

Answer 1

Answer:

Sensitivity of galvanometer is defined as the current in micro ampere required to consume one millimeter deflection on a scale placed 1m away from the mirror.

Now we know that : I=

BNA

Cθ

where C=torque per unit twist, θ= Angle of twist, B=Strength of the magnetic field, N= Number of turns in the coil and A= area of coil.

Thus the sensitivity of galvaometer will not depend on the current it measures.