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  • In a metre bridge experiment, null point is obtained at 20 cm from one end of the wire when resistance is balanced against another resistance . If < , then where will be the new positi

In a metre bridge experiment, null point is obtained at 20 cm from one end of the wire when resistance is balanced against another resistance . If < , then where will be the new position of the null point from the same end, if one decides to balance a resistance of 4 against ?
 

Option: 1

50 cm 


Option: 2

80 cm 


Option: 3

40 cm

 


Option: 4

 70 cm


Answers (1)

best_answer

\begin{aligned} &\mathrm{ \frac{X}{Y}=\frac{20}{80}=\frac{1}{4} \text { or } Y=4 X }\\ & \mathrm{\frac{4 X}{Y}=\frac{l}{100-l} \text { or } \frac{4 X}{4 X}=\frac{l}{100-l} \text { or } l=50 \mathrm{~cm}} \end{aligned}

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sudhir kumar

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