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3.Current Electricity
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For what value of unknown resistance $X$, the potential difference between $B$ and $D$ will be zero in the circuit shown in the figure ............... $\Omega$
A
$4 $
B
$6 $
C
$2 $
D
$5 $
Solution
For balanced Wheatstone bridge $\frac{P}{Q} = \frac{R}{S}$
$ \Rightarrow $ $\frac{{12}}{{(1/2)}} = \frac{{x + 6}}{{(1/2)}}$ $ \Rightarrow $ $x = 6\,\Omega $
Standard 12
Physics
Similar Questions
A student obtained following observations in an experiment of meter bridge to find the unknown resistance of the circuit The most accurate value of unknown resistance is ………… $\Omega$
| S.No. | $R$ | $l$ | $100-l$ | $S = \left( {\frac{{100 – l}}{l}} \right)R$ |
| $1$ | $20\,\Omega $ | $43$ | $57$ | $26.51\,\Omega $ |
| $2$ | $30\,\Omega $ | $51$ | $49$ | $28.82\,\Omega $ |
| $3$ | $40\,\Omega $ | $59$ | $41$ | $27.80\,\Omega $ |
| $4$ | $60\,\Omega $ | $70$ | $30$ | $25.71\,\Omega $ |
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