(C) In a meter bridge,the balance condition is given by $\frac{R}{S} = \frac{l}{100-l}$,where $R$ is the unknown resistance and $S$ is the standard re

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(C) In a meter bridge,the balance condition is given by $\frac{R}{S} = \frac{l}{100-l}$,where $R$ is the unknown resistance and $S$ is the standard resistance.When the unknown resistance $R$ is placed in a higher temperature enclosure,its resistance increases because the resistance of metals increases with temperature $(R_t = R_0(1 + \alpha \Delta T))$.To maintain the same null point position $(l)$,the ratio $\frac{R}{S}$ must remain constant.Since $R$ has increased,$S$ must also be increased to keep the ratio $\frac{R}{S}$ constant.The Assertion states that we should decrease $S$,which is incorrect.Therefore,the Assertion is false,while the Reason is true.

Class 12 Physics Current Electricity Meter Bridge

Medium

Assertion $(A):$ In a meter bridge experiment,the unknown resistance is placed inside an enclosure maintained at a higher temperature. The null point can be obtained at the same position as before by decreasing the value of the standard resistance.
Reason $(R):$ The resistance of a metal increases with an increase in temperature.

AIIMS 2015 All AIIMS

A
If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
B
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
C
If Assertion is true but Reason is false.
D
If both Assertion and Reason are false.

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Shown in the figure below is a meter-bridge set up with null deflection in the galvanometer. The value of the unknown resistor $R$ is ............. $\Omega$.

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In a meter-bridge,if the left and right gaps are connected with $2 \Omega$ and $3 \Omega$ resistances,respectively,then the bridge is balanced. What resistance should be connected with the $3 \Omega$ resistance to get the balancing point at the midpoint of the bridge wire?

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In an experiment to determine the temperature coefficient of resistance of a conductor,a coil of wire $X$ is immersed in a liquid. It is heated by an external agent. $A$ meter bridge setup is used to determine the resistance of the coil $X$ at different temperatures. The balancing points measured at temperatures $t_1=0^{\circ} C$ and $t_2=100^{\circ} C$ are $50 \ cm$ and $60 \ cm$ respectively. If the standard resistance taken out is $S=4 \ \Omega$ in both trials,the temperature coefficient of the coil is

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In a meter bridge (Figure), the null point is found at a distance of $33.7 \; cm$ from $A$. If now a resistance of $12 \; \Omega$ is connected in parallel with $S$, the null point occurs at $51.9 \; cm$. Determine the values of $R$ and $S$.

Medium

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The experimental setup of a meter bridge is shown in the figure. If the null deflection point of the galvanometer is at distance $x$ from end $A$,what will be the new null point if the radius of the wire $AB$ is doubled?

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Shown in the figure below is a meter-bridge set up with null deflection in the galvanometer. The value of the unknown resistor $R$ is ............. $\Omega$.

In a meter-bridge,if the left and right gaps are connected with $2 \Omega$ and $3 \Omega$ resistances,respectively,then the bridge is balanced. What resistance should be connected with the $3 \Omega$ resistance to get the balancing point at the midpoint of the bridge wire?

In a meter bridge (Figure), the null point is found at a distance of $33.7 \; cm$ from $A$. If now a resistance of $12 \; \Omega$ is connected in parallel with $S$, the null point occurs at $51.9 \; cm$. Determine the values of $R$ and $S$.

The experimental setup of a meter bridge is shown in the figure. If the null deflection point of the galvanometer is at distance $x$ from end $A$,what will be the new null point if the radius of the wire $AB$ is doubled?

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