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Q.

In a vernier callipers, one main scale division is x cm and n divisions of the vernier scale coincide with (n - 1) divisions of the main scale. The least count (in cm) of the callipers is 

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a

n-1nx

b

nxn-1

c

xn

d

xn-1

answer is C.

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Detailed Solution

detailed_solution_thumbnail

Vernier constant = value of 1 M.S.D - value of 1 V.S.D. 

Now n V.S.D = (n - 1) M.S.D = (n - 1) x cm

  1 V.S.D=n-1nx cm    L.C.=x cm-n-1nx cm=xn cm

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