Q. 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
Explanation
(a) 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 $l$ also increases.
Hence, balancing point shifts towards right.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.