In a Wheatstone bridge, if the ratio of resistances R1 and R2 is equal to the ratio of R3 and R4, what can be said about the bridge?
Correct Answer: The bridge is balanced.
- Step 1: Understand what a Wheatstone bridge is. It is a circuit used to measure unknown resistances.
- Step 2: Identify the four resistors in the bridge: R1, R2, R3, and R4.
- Step 3: Know that the Wheatstone bridge is balanced when the ratio of R1 to R2 is equal to the ratio of R3 to R4.
- Step 4: Write the condition for balance: R1/R2 = R3/R4.
- Step 5: When this condition is met, it means that the voltage across the galvanometer (the device measuring current) is zero.
- Step 6: Conclude that no current flows through the galvanometer when the bridge is balanced.
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