If one of the resistors in a Wheatstone bridge is replaced with a variable resis

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Question: If one of the resistors in a Wheatstone bridge is replaced with a variable resistor, what is the effect on the balance condition?

Options:

Correct Answer: It can be balanced by adjusting the variable resistor

Solution:

The variable resistor allows for adjustment to achieve balance in the bridge.

If one of the resistors in a Wheatstone bridge is replaced with a variable resistor, what is the effect on the balance condition?

If one of the resistors in a Wheatstone bridge is replaced with a variable resistor, what is the effect on the balance condition?

Correct Answer: The balance condition can be achieved by adjusting the variable resistor.

Step 1: Understand what a Wheatstone bridge is. It is a circuit used to measure resistance by balancing two legs of a bridge circuit.
Step 2: Identify the components of the Wheatstone bridge. It has four resistors (R1, R2, R3, R4) and a power source.
Step 3: Know the balance condition. The bridge is balanced when the ratio of the resistances in one leg equals the ratio in the other leg: (R1/R2) = (R3/R4).
Step 4: Replace one of the resistors (let's say R4) with a variable resistor. A variable resistor can change its resistance value.
Step 5: Adjust the variable resistor. By changing its resistance, you can modify the ratio of the resistances in the bridge.
Step 6: Achieve balance. When you adjust the variable resistor to the right value, you can make the bridge balanced again, satisfying the condition (R1/R2) = (R3/R4).

Wheatstone Bridge Balance Condition – The balance condition of a Wheatstone bridge occurs when the ratio of the resistances in one leg equals the ratio in the other leg, allowing for zero voltage across the galvanometer.
Variable Resistor Functionality – A variable resistor can be adjusted to change the resistance in the circuit, which can help achieve the balance condition by fine-tuning the resistance values.