In the experimental set up of metre bridgre shown in the figure, the null point is obtained at a distance of 40 cm from A. If a \[10\Omega \]resistor is connected in series with \[{{R}_{1}},\] the null point shifts by 10 cm. The resistance that should be connected in parallel with \[({{R}_{1}}+10)\Omega \] such that the null point shifts back to its initial position is- [JEE Main 11-Jan-2019 Evening] |
A) \[40\,\Omega \]
B) \[20\,\Omega \]
C) \[60\,\Omega \]
D) \[30\,\Omega \]
Correct Answer: C
Solution :
[c] Case I: (i) |
Case II: or, |
or |
Case III: Resistance R is connected in parallel with resistance |
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