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

Answer 1

The correct option is A

Shifts towards right

Meter bridge:

1. A Meter bridge is an instrument that is used to find an unknown resistance of a conductor.
2. It works in the principle of the wheatstone bridge.

A metal bridge can be shown as follows:

Effect of heating:

1. When a metal is heated, the resistance of the metal is increased.
2. The formula for the wheatstone bridge mechanism can be written for a meter bridge as follows:

$\frac{R}{l}=\frac{X}{100-l}$

Here, $R$ is the resistance, $X$ is the resistance of the wire on the right-hand side of the balancing point, and $l$ is the balancing length.

3. From the formula, it is evident that when the resistance is increased, the balancing length also needs to be increased.

Hence, the balancing point shifts to the right.

Therefore, option (A) is correct.