a 30. When the jaws of a vernier calipers are in con- tact, the eight division of the vernier scale coincides with the seventh division of the main scale. If Nis the number of divisions on the vernier scale and the least count is x, then the zero error correction is (a) -8x (b) (N-8) (c) - (N - 8)x (d) +8x
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(N−8)x
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