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JEE Advanced
IMPORTANT
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All the resistance in the given Wheatstone bridge have different values and the current through the galvanometer is zero. The current through the galvanometer will still be zero if,

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Important Questions on Electrical Measuring Instruments

HARD
JEE Advanced
IMPORTANT
PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 6 - Electrical Measuring Instruments>Exercise>Q 1
A galvanometer together with an unknown resistance in series is connected across two identical batteries of each 1.5 V. When the batteries are connected in series, the galvanometer records a current of 1 A and when the batteries are connected in parallel, the current is 0.6 A. In this case, the internal resistance of the battery is 1x Ω. What is the value of x?
MEDIUM
JEE Advanced
IMPORTANT
PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 6 - Electrical Measuring Instruments>Exercise>Q 2
In the circuit shown in figure, the internal resistance of the cell is negligible. For the value of R=40x Ω, no current flows through the galvanometer. What is x?
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HARD
JEE Advanced
IMPORTANT
PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 6 - Electrical Measuring Instruments>Exercise>Q 3
A 5 m potentiometer wire having 3 Ω resistance per meter is connected to a storage cell of steady emf 2 V and internal resistance 1 Ω. A primary cell is balanced against 3.5 m of it. When a resistance of 32n Ω is put in series with the storage cell, the null point shifts to the centre of the last wire, i.e., 4.5 m. What is n?
HARD
JEE Advanced
IMPORTANT
PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 6 - Electrical Measuring Instruments>Exercise>Q 4
The ammeter shown in figure consists of 480 Ω coil connected in parallel to 20 Ω shunt. Find the reading of the ammeter (in A).
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MEDIUM
JEE Advanced
IMPORTANT
PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 6 - Electrical Measuring Instruments>Exercise>Q 5
A potentiometer wire of length 10 m and resistance 30 Ω is connected in series with a battery of emf  2.5 V, internal resistance 5 Ω and external resistance R. If the fall of potential along the potentiometer wire is 50 µV mm-1, find the value of R (in Ω).
EASY
JEE Advanced
IMPORTANT
PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 6 - Electrical Measuring Instruments>Exercise>Q 6
Find the reading of the ammeters A1 (in ampere) connected as shown in the network.
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EASY
JEE Advanced
IMPORTANT
PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 6 - Electrical Measuring Instruments>Exercise>Q 7
In the figure, the ammeter (I) reads a current of 10 mA, while the voltmeter reads a potential difference of 3 V. The ammeters are identical, and the internal resistance of the battery is negligible (consider all ammeters and voltmeters as non-ideal).
The resistance of the ammeter is, m×102 Ω. What is the value of m?
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EASY
JEE Advanced
IMPORTANT
PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 6 - Electrical Measuring Instruments>Exercise>Q 8
The maximum current in a galvanometer can be 10 mA. Its resistance is 10 Ω. To convert it into an ammeter of 1 A, the resistance should be connected in parallel with galvanometer is n99 Ω. Write the value of n.