If the zero lines, marked on a circular scale, are below the reference line of the main scale, then there is a positive zero error and the correction is ____.

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Detailed Solution

Concept- In this question, apply the concept that if the instrument's pointer is below zero, it is considered a negative zero error, and if the pointer is above zero, it is called a positive zero error. This will aid in obtaining an accurate reading.
Before we begin the experiment, we must calibrate the instrument and determine its zero error.
So, if the instrument's pointer indicates less than zero, we have a negative zero error, and we must include the size of this error in the measured reading of the instrument.
As a result, true reading Equals measured reading multiplied by magnitude of negative zero error.
If the instrument's pointer is above zero, we have a positive zero error, and we must remove the size of this error from the measured value of the instrument.
As a result, correct reading equals measured reading minus magnitude of positive zero error.
If the instrument's pointer is exactly at zero, this is referred to as a null zero error, and the measured reading is equal to the true reading of the instrument.
Hence, the answer is negative.

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