Answer:
Accurate scale reading begins from zero as shown
below:
But here the reading on scale begins with 3 cm
Thus, the error in the scale = 3 cm- 0 cm= 3 cm Now, the other end on the scale
reads = 33.1 cm
Thus, the actual length of the needle = (Reading on
the other end- Error reading of first end) = 33.1 cm - 3 cm = 30.1 cm
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