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A screw gauge gives the following reading, when used to measure the diameter of a wire.
Main scale reading : 0 mm
Circular scale reading : 52 divisions
Given that 1 mm on main scale corresponds to 100 divisions of the circular scale
The diameter of the wire from the above data is

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0.026 cm

0.016 m

0.052 cm

0.062 m

answer is C.

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Detailed Solution

Diameter of wire = MSR + CSR $\times$ LC

Given main scale reading (MSR) = 0 mm

Circular scale reading = 52

$L e a s t c o u n t = \frac{V a l u e o f 1 m a i n s c a l e d i v i s i o n}{T o t a l d i v i s i o n s o n c i r c u l a r s c a l e}$

$L C = 0 + 52 \times \frac{1}{100}$

= 0.52 mm

= 0.052 cm

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