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Q.

In a Vernier calipers, N divisions of the main scale coincide N+m divisions of the Vernier scale. What is the value of m for which the instrument has minimum least count?

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a

2

b

1

c

0.1

d

10

answer is A.

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Detailed Solution

(N+m)VSD=(N)MSD1VSD=NN+mMSDLC=1MSD-1VSD=1MSD-NN+mMSD=mN+mMSD=11+N/mMSDNow, least count will be minimum for m=1.
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