In a Wheatstone bridge, if the resistance P is increased, what effect does it ha

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Question: In a Wheatstone bridge, if the resistance P is increased, what effect does it have on the balance condition?

Options:

Correct Answer: Bridge becomes unbalanced

Solution:

Increasing resistance P will disturb the balance condition, making the bridge unbalanced.

In a Wheatstone bridge, if the resistance P is increased, what effect does it have on the balance condition?

In a Wheatstone bridge, if the resistance P is increased, what effect does it have on the balance condition?

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 resistances: P, Q, R, and S.
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, specifically when (P/Q) = (R/S).
Step 4: Consider what happens when resistance P is increased. If P increases, the ratio (P/Q) becomes larger.
Step 5: Since the balance condition depends on the equality of the ratios, increasing P will disturb this equality.
Step 6: Conclude that when P is increased, the bridge becomes unbalanced, meaning it will no longer satisfy the balance condition.

Wheatstone Bridge Balance Condition – The balance condition of a Wheatstone bridge occurs when the ratio of the resistances in one leg is equal to the ratio in the other leg, allowing for no current to flow through the galvanometer.
Effect of Resistance Change – Changing the resistance in one arm of the bridge (like increasing P) alters the balance condition, leading to an unbalanced state.