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Q.

In the reading shown in the figure, find the zero error, if each division of main scale is 1 mm

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a

$- 0.05 c m$

b

$0.05 c m$

c

$- 0.03 c m$

d

$0.03 c m$

answer is C.

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Detailed Solution

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IIIrd division Vernier scale excess coincide with main scale division. So error is $3 \times 0.01 c m .$
$= 0.03 c m$

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In the reading shown in the figure, find the zero error, if each division of main scale is 1 mm