The value of $$R$$ in the given circuit when there is no current in the $$5 ~\Omega$$ resistor is:

 1 $$12~\Omega$$ 2 $$9~ \Omega$$ 3 $$3~ \Omega$$ 4 $$2~ \Omega$$
Subtopic: Â Wheatstone Bridge |
Â 81%
From NCERT
NEET - 2024
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The given circuit shows a uniform straight wire $$AB$$ of $$40 ~\text{cm}$$ length fixed at both ends. In order to get zero reading in the galvanometer $$G,$$ the free end of $$J$$ is to be placed from the end $$B$$ at:

1. $$32~\text{cm}$$
2. $$8~\text{cm}$$
3. $$16~\text{cm}$$
4. $$24~\text{cm}$$
Subtopic: Â Wheatstone Bridge |
Â 61%
From NCERT
NEET - 2024
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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 |
Â 74%
From NCERT
NEET - 2022
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
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To view explanation, please take trial in the course.
NEET 2025 - Target Batch