Pitch of screw gauge is 1 mm. There are 100 divisions on circular scale. While measuring diameter of wire the linear scale reads 1 mm and 45 th division of circular scale coincides with reference line of main scale. Length of wire is 5.0 cm measured by metre scale. The surface area of wire to correct significant figure is -
Text Solution
Verified by ExpertsThe correct answer is:
C
2r = 1+ 0.45 = 1.45 mm = 0.145 cm
CSA = 2 π r λ = 0.145 × 3.14 × 5 = 2.27
CA = 2 π r λ 2 = 2 × 3.14 × (0.0725) 2 = 0.030
SA = CSA + CA = 2.27 + 0.030 = 2.30 cm 2
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