For positive error, the correction is.

Options

A. Positive
B. negative
C. nil
D. may be positive or negative

Answer

To solve the question "For positive error, the correction is," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Error**:
- In measurements, an error can be classified as positive or negative. A positive error indicates that the measured value is greater than the actual value.

2. **Define the Variables**:
- Let the actual value of the quantity be represented as \( x \).
- Let the error be represented as \( \Delta x \).

3. **Express the Measured Value**:
- If there is a positive error, the measured value can be expressed as:
\[ \text{Measured Value} = x + \Delta x \]
- Here, \( x + \Delta x \) is greater than \( x \) because \( \Delta x \) is positive.

4. **Determine the Correction Needed**:
- To find the actual value \( x \) from the measured value \( x + \Delta x \), we need to correct the measured value by removing the error.
- This means we need to subtract \( \Delta x \) from the measured value:
\[ \text{Correction} = x + \Delta x - \Delta x = x \]
- Therefore, the correction needed is:
\[ \text{Correction} = -\Delta x \]

5. **Conclusion**:
- Since we are subtracting \( \Delta x \) to correct the positive error, the correction is negative. Thus, the answer to the question is that the correction for a positive error is negative.

### Final Answer:
- The correction for a positive error is **negative**.

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