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A milliammeter of range 10 mA and resistance 9 Ω is joined in a circuit as shown in the figure. The meter gives full-scale deflection for current I when A and B are used as its terminals. If current enters at A and leaves at B (C is left isolated) the value of I is
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Important Questions on Electrical Measuring Instruments

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JEE Advanced
IMPORTANT
PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 6 - Electrical Measuring Instruments>Exercise>Q 23
A candidate connects a moving coil voltmeter V, a moving coil ammeter A, and a resistor R as shown in the figure. If the voltmeter reads 20 V and the ammeter reads 4 A, R is
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JEE Advanced
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PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 6 - Electrical Measuring Instruments>Exercise>Q 24
If a shunt 110 of the coil resistance is applied to a moving coil galvanometer, its sensitivity becomes
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JEE Advanced
IMPORTANT
PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 6 - Electrical Measuring Instruments>Exercise>Q 25
In figure, when an ideal voltmeter is connected across 4000 Ω resistance, it reads 30 V. If the voltmeter is connected across 3000 Ω resistance, it will read
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JEE Advanced
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PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 6 - Electrical Measuring Instruments>Exercise>Q 26
A voltmeter has a resistance of G ohm and range V volt. The value of resistance used in series to convert it into voltmeter of range nV volt is
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JEE Advanced
IMPORTANT
PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 6 - Electrical Measuring Instruments>Exercise>Q 27
A galvanometer has a resistance of 3663 Ω. A shunt S is connected across it such that 1/34 of the total current passes through the galvanometer. The value of the shunt is,
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JEE Advanced
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PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 6 - Electrical Measuring Instruments>Exercise>Q 28

In previous question, the combined resistance of the shunt and the galvanometer is,

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A galvanometer has a resistance of 3663 Ω. A shunt S is connected across it such that 1/34 of the total current passes through the galvanometer. The value of the shunt is
HARD
JEE Advanced
IMPORTANT
PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 6 - Electrical Measuring Instruments>Exercise>Q 29
A galvanometer has a resistance of 3663 Ω. A shunt S is connected across it such that 1/34th of the total current in main circuit passes through the galvanometer. The external resistance that must be connected in series with the main circuit, so that the total current in the main circuit remains unaltered before and after the galvanometer is shunted is, 
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JEE Advanced
IMPORTANT
PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 6 - Electrical Measuring Instruments>Exercise>Q 30
An ammeter is obtained by shunting a 30 Ω galvanometer with a 30 Ω resistance. What additional shunt should be connected across it to double the range?