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  4. The galvanometer cannot as such be used as an ammeter to measure the value of current in a given circuit. The following reasons are I. galvanometergives full scale deflection for a small current. II. galvanometer has a large resistance. III. a linear scale cannot be designed so that I propto φ. IV. a galvanometer can give inaccurate values.

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Q. The galvanometer cannot as such be used as an ammeter to measure the value of current in a given circuit. The following reasons are
I. galvanometergives full scale deflection for a small current.
II. galvanometer has a large resistance.
III. a linear scale cannot be designed so that $I \propto \phi$.
IV. a galvanometer can give inaccurate values.

Moving Charges and Magnetism

Solution:

I Galvanometer is a very sensitive device, it gives a full scale deflection for a current of the order of $\mu A$.
II For measuring currents, the galvanometer has to be connected in series and as it has a large resistance, this will change the value of the current in the circuit.