What happens to the total resistance in a Wheatstone bridge when it is balanced?
Practice Questions
Q1
What happens to the total resistance in a Wheatstone bridge when it is balanced?
It is maximum.
It is minimum.
It is equal to the sum of all resistances.
It is equal to the product of resistances.
Questions & Step-by-Step Solutions
What happens to the total resistance in a Wheatstone bridge when it is balanced?
Correct Answer: Total resistance is at a minimum.
Step 1: Understand what a Wheatstone bridge is. It is a circuit used to measure unknown resistances.
Step 2: Know that a Wheatstone bridge has four resistors arranged in a diamond shape.
Step 3: Learn that the bridge is considered 'balanced' when the ratio of the two resistors on one side is equal to the ratio of the two resistors on the other side.
Step 4: When the bridge is balanced, the voltage across the middle (where a galvanometer is connected) is zero.
Step 5: In this balanced state, the total resistance of the circuit is minimized for the given configuration of resistors.
