In a metre bridge experiment, null point is obtained at $$20$$ cm from one end of the wire when resistance X is connected against Y . Where will be the new position of the null point from the same end, if one decides to balance a resistance of $$4X$$ against Y ?

Question

In  a metre bridge experiment, null point is obtained at $$20$$ cm     from one end of the wire when resistance X      is connected against  Y     . Where will be the new position of the null point from the  same end, if one decides to balance a resistance of  $$4X$$     against  Y     ?

Infinity Learn · Accepted Answer

Length  $$l=20$$ cm       Resistance  $$R=X$$     Resistance  $$S=Y$$     case (i)     $$RS=l100$$−l     $$XY=20100$$−$$20$$     $$XY=14$$     $$case(ii)$$     $$4XY=l1100$$−$$l1$$     $$4(14)=l1100$$−$$l1$$     $$2l1=100$$     ∴   $$l1=50$$ cm

In a metre bridge experiment, null point is obtained at $20 c m$ from one end of the wire when resistance $X$ is connected against $Y$ . Where will be the new position of the null point from the same end, if one decides to balance a resistance of $4 X$ against $Y$ ?

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In a metre bridge experiment, null point is obtained at 20 cm from one end of the wire when resistance X is connected against Y . Where will be the new position of the null point from the same end, if one decides to balance a resistance of 4X against Y ?

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Ready to Test Your Skills?

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In a metre bridge experiment, null point is obtained at $20 c m$ from one end of the wire when resistance $X$ is connected against $Y$ . Where will be the new position of the null point from the same end, if one decides to balance a resistance of $4 X$ against $Y$ ?