Answer Posted / saravanamurthy

Justification Steps:

1. Interpolate the coordinates of % opening and Current in Y-axis and X-axis Respectively

2.Connect the coordinates , you will get a straight line

3.Since it is with slope , it's our responsiblity to calculate the slope so that we can project it in normal plane
Slope Calculation:
a.Equation of straight line : Y=mX+C

where,
Y- Current in mA
X-%opening of full scale
m-Slope of the straight line
C- constant (calculated from Y intercept )

b.Calculate Slope using the formula:

m=(X2 - X1)/(Y2 - Y1 )

4.In this range of current , the value of slope is found to be constant , ie.m=0.16, but when we go for some other ranges slope changes as it ascends so its non linear for other ranges.
5.finally straight line equation for the above range is Y=0.16*X+4
6.This constant slope means that the line is linear


Regards,

S.I.Saravanamurthy

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