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A bar code reader emits-
A barcode reader emits ---
When a bar of length '$$l$$' and diameter 'd' is rigidly fixed at the upper end and hanging freely, then the total elongation produced in the bar due to its own weight is (where w = Weight per unit volume of the bar)
A printed document reader which scans the characters and then encodes them in a computer-compatible code for direct transmission to the computer is called