In a Wheatstone bridge, if the resistance R4 is adjusted to achieve balance, what does this imply about the other resistances?
Correct Answer: The other resistances are in a specific ratio.
- Step 1: Understand that a Wheatstone bridge consists of four resistors arranged in a diamond shape.
- Step 2: Identify the resistors as R1, R2, R3, and R4.
- Step 3: Know that the bridge is balanced when the voltage across the middle (between R2 and R4) is zero.
- Step 4: Realize that to achieve balance, the ratio of R1 to R2 must equal the ratio of R3 to R4.
- Step 5: This means that if you adjust R4, you are changing the balance point, but the relationship between R1, R2, and R3 must still hold.
- Step 6: Conclude that adjusting R4 to achieve balance implies that R1/R2 = R3/R4.
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