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Why is the Gray code more practical to use when coding the position of a rotating shaft?

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Why is the Gray code more practical to use when coding the position of a rotating shaft?

(a) All digits change between counts

(b) Two digits change between counts

(c) Only one digit changes between counts

(d) Alternate digit changes between counts

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My query is from Code Converters topic in section Combinational Circuits of Digital Circuits

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Right option is (c) Only one digit changes between counts

To explain I would say: The Gray code is more practical to use when coding the position of a rotating shaft because only one digit changes between counts that is reflected to the next count.

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