A Wheatstone bridge is used to determine the value of unknown resistance \(\mathrm{X}\) by adjusting the variable resistance \(\mathrm{Y}\) as shown in the figure. For the most precise measurement of \(\mathrm{X}\), the resistances \(\mathrm{P}\) and \(\mathrm{Q}\):
1.
do not play any significant role.
2.
should be approximately equal to \(2\mathrm{X}\).
3.
should be approximately equal and are small.
4.
should be very large and unequal.
Subtopic: Â Wheatstone Bridge |
 74%
From NCERT
NEET - 2022
Other Reason
Add Note
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Upgrade Your Plan
Upgrade now and unlock your full question bank experience with daily practice.
In the Wheatstone Bridge arrangement shown, the resistance \(P\) is \(2~ \Omega.\) The bridge is initially balanced. If P and Q are interchanged: an amount equal to \(S\) has to be added to \(R\) to restore the balance. The resistance \(Q\) equals (nearly):
1. \(2 ~\Omega\)
2. \(3.2 ~\Omega\)
3. \(4 ~\Omega\)
4. \(6.4 ~\Omega\)
Subtopic: Â Wheatstone Bridge |
 50%
From NCERT
Other Reason
Add Note
Please attempt this question first.
Hints
Please attempt this question first.
Upgrade Your Plan
Upgrade now and unlock your full question bank experience with daily practice.
In a Wheatstone Bridge arrangement, as shown in the figure, the bridge is balanced. However, when the resistances in the arms P, Q are switched, the bridge is balanced only when \(R\) is replaced by \(4R\) in the other two arms. If the value of R is \(100\)\(\Omega\), that of S is:
1. \(100\)\(\Omega\)
2. \(50\)\(\Omega\)
3. \(200\)\(\Omega\)
4. \(400\)\(\Omega\)
Subtopic: Â Wheatstone Bridge |
 55%
From NCERT
Other Reason
Add Note
Please attempt this question first.
Hints
Please attempt this question first.
Upgrade Your Plan
Upgrade now and unlock your full question bank experience with daily practice.