When a metal conductor connected to the left gap of a meter bridge is heated, the balancing point

Question

When a metal conductor connected to the left gap of a meter bridge is heated, the balancing point (A) shifts towards right (B) shifts towards left (C) remains unchanged (D) remains at zero

Tardigrade Admin · Accepted Answer

As the resistance of metal increases on increasing the temperature,
so resistance of metal conductor in left arm will increase on heating.
For meter bridge

\frac{R _{1}}{R _{2}} = \frac{l}{100 - l}

As

R_{1}

increases

I

also increases.
Hence, balancing point shifts towards right.

Q. When a metal conductor connected to the left gap of a meter bridge is heated, the balancing point

shifts towards right

shifts towards left

remains unchanged

remains at zero

As the resistance of metal increases on increasing the temperature, so resistance of metal conductor in left arm will increase on heating. For meter bridge R2​R1​​=100−ll​ As R1​ increases I also increases. Hence, balancing point shifts towards right.

As the resistance of metal increases on increasing the temperature,
so resistance of metal conductor in left arm will increase on heating.
For meter bridge $\frac{R _{1}}{R _{2}} = \frac{l}{100 - l}$
As $R_{1}$ increases $I$ also increases.
Hence, balancing point shifts towards right.