If the resistance R4 in a Wheatstone bridge is decreased, what effect does it ha

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Question: If the resistance R4 in a Wheatstone bridge is decreased, what effect does it have on the balance condition?

Options:

Correct Answer: The bridge becomes unbalanced

Solution:

Decreasing R4 will disturb the balance condition, making the bridge unbalanced.

If the resistance R4 in a Wheatstone bridge is decreased, what effect does it have on the balance condition?

If the resistance R4 in a Wheatstone bridge is decreased, what effect does it have on the balance condition?

Correct Answer: The bridge becomes unbalanced.

Step 1: Understand what a Wheatstone bridge is. It is a circuit used to measure unknown resistances by balancing two legs of a bridge circuit.
Step 2: Identify the components of the Wheatstone bridge. It has four resistors: R1, R2, R3, and R4, and a power source.
Step 3: Know the balance condition. The bridge is balanced when the ratio of R1 to R2 is equal to the ratio of R3 to R4 (R1/R2 = R3/R4).
Step 4: Recognize what happens when R4 is decreased. If R4 becomes smaller, the ratio R3/R4 increases because R3 stays the same.
Step 5: Compare the ratios. Since R1/R2 remains the same, but R3/R4 increases, the two ratios are no longer equal.
Step 6: Conclude that the bridge is unbalanced. Decreasing R4 disturbs the balance condition of the Wheatstone bridge.

Wheatstone Bridge Balance Condition – The balance condition of a Wheatstone bridge occurs when the ratio of resistances in one leg equals the ratio in the other leg, allowing no current to flow through the galvanometer.