A student measured the diameter of a wire using a screw gauge with the least count $0.001 \mathrm{~cm}$ and…
A student measured the diameter of a wire using a screw gauge with the least count $0.001 \mathrm{~cm}$ and listed the measurements. The measured value should be recorded as
$5.3200 \mathrm{~cm}$
$5.3 \mathrm{~cm}$
$5.32 \mathrm{~cm}$
$5.320 \mathrm{~cm}$
Solution
The least count (L.C.) of a screw guage is the smallest length which can be measured accurately with it.
As least count is $0.001 \mathrm{~cm}=\frac{1}{1000} \mathrm{~cm}$
Hence measured value should be recorded upto 3 decimal places i.e., $5.320 \mathrm{~cm}$