Wheatstone Bridge

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Wheatstone Bridge: Overview

This Topic covers sub-topics such as Wheatstone Bridge, Electrical Instruments, Unbalanced Wheatstone Bridge, Balanced Wheatstone Bridge and, Sensitivity of Wheatstone Bridge

Important Questions on Wheatstone Bridge

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The magnitude of resistance X  in the circuit shown in the given figure, when no current flows through the  Ω  resistor is

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A battery of 6 V is connected to the circuit as shown below. The current I drawn from the battery is

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The current I in the given circuit will be

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Figure shows an unbalanced Wheatstone bridge. What is the direction of conventional current between B and D?

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The figure given below shows a network of eight resistors, each equal to 2 Ω, connected to a 3 V battery of negligible internal resistance. The current I in the circuit is 

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Find the equivalent resistance between X and Y.

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The current I drawn from the 5 V source will be

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The figure shows a circuit diagram of a Wheatstone bridge to measure the resistance G of the galvanometer. The relation PQ=RG will be satisfied only when

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In the balanced condition, the values of the resistances of the four arms of a Wheatstone bridge are shown in the figure below. The resistance R3 has temperature coefficient 0.0004C-1. If the temperature of R3 is increased by 100°C, the voltage developed between S and T will be k×10-2 V. Find the value of k. (Approximate the answer to the nearest integer.)

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AB and CD are two uniform resistance wire of lengths 100 cm and 80 cm respectively. The connections are shown in the figure. The cell of emf 5 V is ideal while the other cell of emf E has internal resistance 2 Ω. A length of 20 cm of wire CD is balanced by 40 cm of wire AB. Find emf in volt, if the reading of the ideal ammeter is 2 A. The other connecting wires have negligible resistance.

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The effective resistance between A and B is

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As shown in the figure below, a cube is formed with ten identical resistance R (thick lines) and two shorting wires (dotted lines) along the arms AC and BD.
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The resistance between points A and B is

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Figure a below shows a Wheatstone bridge in which P,Q,R,S are fixed resistances, G is a galvanometer and B is a battery. For this particular case, the galvanometer shows zero deflection. Now, only the positions of B and G are interchanged, as shown in figure b. The new deflection of the galvanometer-
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Find the equivalent resistance between X and Y.

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The effective resistance between points P and Q of the electrical circuit as shown in the figure is

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What is the value of R in Ohms such that the current in the galvanometer is zero?

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In the arrangement of resistances shown below, the effective resistance between points A and B is

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Find the equivalent resistance between the points A and B :-

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Five capacitors of 10 μF capacity each are connected to a DC potential of 100 volts as shown in figure. The equivalent capacitance between the points A and B will be equal to :-

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On interchanging the position of battery and galvanometer in Wheatstone bridge respectively the new balance point: