b (b) Angular momentum = $mvr = ML{T^{ - 1}} \times L = M{L^2}{T^{ - 1}}$
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A travelling microscope has $20$ divisions per $cm$ on the main scale while its Vernier scale has total $50$ divisions and $25$ Vernier scale divisions are equal to $24$ main scale divisions, what is the least count of the travelling microscope $..........\,cm$
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