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

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

J & K CETJ & K CET 2007Current Electricity

Solution:

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.