Advertisements
Advertisements
Question
Define current sensitivity of a galvanometer.
Advertisements
Solution
Current sensitivity of a galvanometer is defined as the deflection produced in the galvanometer when a unit current flows through it.
θ = `("nBA")/"k""I"`
So, for a given value of I, θ will be large if `("nBA")/"k"` is large i.e n, B and A should be large and k should be small.
APPEARS IN
RELATED QUESTIONS
An ideal voltmeter has _______.
(A) low resistance
(b) high resistance
(C) infinite resistance
(D) zero resistance
Why is it necessary to introduce a cylindrical soft iron core inside the coil of a galvanometer?
Can a galvanometer as such be used for measuring the current? Explain.
Write current sensitivity of a galvanomete S.I. unit.
Explain the significance of a radial magnetic field when a current-carrying coil is kept in it.
A moving coil galvanometer can be converted into an ammeter by ______.
A galvanometer of resistance 100 Ω gives a full-scale deflection for a current of 10−5 A. To convert it into an ammeter capable of measuring up to 1 A we should connect a resistance of ______.
A galvanometer having a resistance of 20 Ω and 30 Ω division on both sides has figure of merit 0.005 ampere/division. The resistance that should be connected in series such that it can be used as a voltmeter upto 15 volt, is ______.
A resistance of 3Ω is connected in parallel to a galvanometer of resistance 297Ω. Find the fraction of current passing through the galvanometer.
The current sensitivity of a moving coil galvanometer is given by:
