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What is the smallest value of current th...

What is the smallest value of current that can be measured with a moving coil galvanometer ?

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Moving coil galvanometer is sensitive galvanometer, it is used to measure very small current upto `10^(-9)A.`
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What is the principle of a moving coil galvanometer ?

In the circuit (Fig.) the current is to be measured. What is the value of the current if the ammeter shown (a) is a galvanometer with a resistance R_(G)=60.00 Omega, (b) is a galvanometer described in (a) but converted to an ammeter by a shunt resistance r_(s)=0.02 Omega, (c) is an ideal ammeter with zero resistance ?

How can galvanometer be converted to a voltmeter ? Why is the series resistance greater that the galvanometer resistance ? A moving coil galvanometer of resistance 5Omega can measure a current of 15mA. What is the series resistance required if it is to measure 1.5 V ?

How can a galvanometer be converted to an ammeter ? Why is the parallel resistance smaller that the galvanometer resistance ? A moving coil galvanometer can measure a current of 10^(-6) A. What is the resistance of the shunt required if it is to measure 1A ?

(A) : Working of a moving coil galvanometer is based on heating effect of current. (R) : On heating, the coil starts to rotate in moving coil galvanometer because fo torque.

How do you convert a moving coil galvanometer into an ammeter ?