What are advantages of null-point method in a Wheatstone bridge ? What additional measurements would

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3.Current Electricity

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What are the advantages of the null-point method in a Wheatstone bridge ? What additional measurements would be required to calculate ${{\rm{R}}_{{\rm{unknown}}}}$ by any other method ?

Option A

Option B

Option C

Option D

Solution

In Wheatstone bridge advantage of null point method is that there is no change in position of null point due to resistance of galvanometer. Hence, there is no need to determine current in resistance or internal resistance of galvanometer.

This method is easy and comfortable for observer.

In an another method to determine unknown resistance Kirchhoff's laws are used. For these precise current measurement is to be done through all branches of resistors, galvanometer and internal resistance of galvanometer.

Note : Necessary and required condition for balance of Wheatstone bridge,

$\frac{P}{Q}=\frac{R}{S}$

where $P$ and $Q$ is ratio of length, $R$ is unknown resistor and $S$ is known resistor.

Standard 12

Physics

For what value of unknown resistance $X$, the potential difference between $B$ and $D$ will be zero in the circuit shown in the figure …………… $\Omega$

medium

Shown in the figure below is a meter-bridge set up with null deflection in the galvanometer. The value of the unknown resistor $R$ is …………. $\Omega$

easy

(AIEEE-2008)

Write principle of Wheatstone bridge.

medium

ln a balanced wheat stone bridge, current in the galvanometer is zero. It remains zero when:

$[1]$ battery emf is increased

$[2]$ all resistances are increased by $10\,ohms$

$[3]$ all resistances are made five times

$[4]$ the battery and the galvanometer are interchanged

medium

Wheatstone bridge principle is used to measure the specific resistance $\left(S_1\right)$ of given wire, having length $L$, radius $r$. If $X$ is the resistance of wire, then specific resistance is: $S_1=X\left(\frac{\pi r^2}{L}\right)$. If the length of the wire gets doubled then the value of specific resistance will be :

hard

(JEE MAIN-2024)

What are the advantages of the null-point method in a Wheatstone bridge ? What additional measurements would be required to calculate ${{\rm{R}}_{{\rm{unknown}}}}$ by any other method ?

Solution

Similar Questions

For what value of unknown resistance $X$, the potential difference between $B$ and $D$ will be zero in the circuit shown in the figure …………… $\Omega$

Shown in the figure below is a meter-bridge set up with null deflection in the galvanometer. The value of the unknown resistor $R$ is …………. $\Omega$

Write principle of Wheatstone bridge.

ln a balanced wheat stone bridge, current in the galvanometer is zero. It remains zero when: $[1]$ battery emf is increased $[2]$ all resistances are increased by $10\,ohms$ $[3]$ all resistances are made five times $[4]$ the battery and the galvanometer are interchanged

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ln a balanced wheat stone bridge, current in the galvanometer is zero. It remains zero when:

$[1]$ battery emf is increased

$[2]$ all resistances are increased by $10\,ohms$

$[3]$ all resistances are made five times

$[4]$ the battery and the galvanometer are interchanged